Best Reptile Enclosures: Glass vs PVC vs Screen — Which Is Right for Your Reptile?

Choosing the best reptile enclosure involves more than finding a tank that looks attractive or fits comfortably in your home. The enclosure must provide enough space for your reptile to move naturally while allowing you to maintain appropriate temperatures, humidity, ventilation and lighting.

Glass, PVC and screen enclosures are three popular options, but each has distinct characteristics. Glass terrariums offer excellent visibility, PVC enclosures can make heat and humidity management easier, and screen cages provide substantial airflow. However, none is automatically suitable for every reptile.

In this guide, we’ll compare glass, PVC and screen reptile enclosures, explore their advantages and limitations, and examine three purpose-built products worth considering. You’ll also learn how to choose the right enclosure size, layout and features for your reptile.

If you’re considering alternatives to purpose-built habitats, I’ve also covered [using a grow tent as a reptile enclosure], including the additional heating, ventilation and safety considerations involved.

Affiliate Disclosure: As an Amazon Associate I earn from qualifying purchases. This post contains affiliate links at no extra cost to you.

Quick Answer: Glass vs PVC vs Screen Reptile Enclosures

The main difference between these enclosure types is how their construction affects visibility, insulation, humidity retention and ventilation.

Feature	Glass	PVC	Screen
Visibility	Excellent	Usually front-focused	Through mesh panels
Heat retention	Moderate	Generally good	Low
Humidity retention	Depends on ventilation	Generally good	Low
Ventilation	Depends on vent design	Depends on vent design	High
Weight	Relatively heavy	Often lighter than glass	Lightweight
Customization	More limited	Often more flexible	Depends on the frame and mesh
Cleaning	Usually straightforward	Usually straightforward	Mesh requires additional care
Common design	Front-opening terrarium	Solid-sided habitat	Mesh-sided cage

These are general characteristics of enclosure materials, not recommendations for particular species. Heating, humidity, ventilation and enclosure dimensions should always be matched to the reptile’s requirements.

What Makes a Good Reptile Enclosure?

Before comparing materials, it’s important to understand the features that make an enclosure suitable for a particular animal.

1. Appropriate Size

An enclosure should accommodate the reptile’s adult size and natural behavior rather than simply fitting its current juvenile dimensions.

Terrestrial reptiles need sufficient usable floor space, arboreal species require appropriate vertical space and climbing opportunities, and burrowing species need suitable substrate depth.

There must also be enough room for hides, furnishings, water provisions and the temperature gradient required by the species.

2. Adequate Ventilation

Ventilation helps exchange air and manage moisture. However, both insufficient and excessive ventilation can create environmental-control challenges.

An enclosure that loses heat and humidity too quickly may be difficult to regulate. Conversely, inadequate airflow can contribute to persistently damp conditions and poor air quality.

The correct ventilation arrangement depends on the species and the conditions inside the enclosure.

3. Safe Temperature Control

Reptiles rely on environmental heat to regulate their body temperature. Depending on the species, an enclosure may need a warmer basking area and a cooler retreat.

Heating equipment should be installed according to the manufacturer’s instructions, protected against animal contact where necessary, and controlled by an appropriate thermostat.

Temperatures should also be checked using independent measuring equipment rather than relying exclusively on the thermostat’s display.

4. Suitable Humidity

Humidity requirements vary considerably between species.

Some reptiles require relatively dry conditions, while others need higher humidity or particular daily humidity cycles.

The enclosure material affects how easily these conditions can be maintained, but it does not determine the correct humidity target.

5. UVB and Lighting Compatibility

Where UVB lighting is required, the enclosure must accommodate a suitable lamp at the correct distance and position.

Lighting requirements are species-specific. Glass and many plastics block UVB, so a UVB lamp should not be assumed to work effectively through a solid enclosure panel.

6. Security and Escape Prevention

A suitable enclosure should have secure doors, properly fitted vents and no accessible gaps through which the animal could escape.

Pay particular attention to door locks, cable openings, ventilation openings and removable panels.

7. Ease of Cleaning and Maintenance

The enclosure should allow you to clean surfaces, inspect the animal, replace water and maintain equipment without unnecessary difficulty.

Easy access is particularly valuable in larger or heavily furnished habitats.

Glass Reptile Enclosures

Glass terrariums are among the most recognizable types of reptile housing. They are available in different sizes and may feature front-opening doors, top access, screen ventilation panels or combinations of these features.

Traditional aquarium-style tanks generally provide access from above, while modern purpose-built reptile terrariums often have front-opening doors and ventilation arrangements designed for animal housing.

For this guide, we’re focusing on purpose-built reptile terrariums rather than ordinary aquariums.

Advantages of Glass Reptile Enclosures

Excellent visibility

Glass provides a clear view of the animal and its habitat. This makes it particularly appealing for people who want an attractive display enclosure.

Easy-to-clean surfaces

Glass is non-porous and can be cleaned using appropriate reptile-safe cleaning products.

Widely available designs

Glass terrariums come in horizontal and vertical configurations, with different door and ventilation arrangements.

Suitable for attractive display setups

Their clear panels make it easy to appreciate planted habitats, climbing structures and other carefully arranged furnishings.

Moisture-resistant construction

Glass itself is not damaged by humidity, although seals, fittings and other components still require maintenance.

Disadvantages of Glass Reptile Enclosures

Considerable weight

Large glass enclosures can be heavy and difficult to move, especially once furnished.

Limited insulation

Glass generally provides less insulation than solid PVC panels, so heating requirements may be greater in a cool room.

Potential temperature fluctuations

Changes in room temperature can influence conditions inside the enclosure, particularly when heating and ventilation are not adequately controlled.

Limited modification options

Adding ventilation openings or mounting equipment can be more difficult than with some PVC designs.

Risk of breakage

Glass can crack or break if subjected to impact, incorrect support or excessive stress.

Glass Enclosure Pick: REPTI ZOO 67-Gallon Glass Reptile Terrarium

The REPTI ZOO 67-Gallon Glass Reptile Terrarium is a purpose-built, front-opening enclosure measuring approximately 48 × 18 × 18 inches.

Its long horizontal design provides a useful footprint for setups that prioritize ground space, while the glass construction offers clear viewing from the front.

Key features

• Approximately 48 × 18 × 18 inches.
• Glass terrarium construction.
• Front-opening sliding doors.
• Screen ventilation.
• Knock-down design

Why consider it?

This model is worth examining if you want a long glass enclosure with convenient front access and a clear view of the habitat.

The sliding doors can make routine cleaning, feeding and maintenance more convenient than reaching through the top of a tank.

Things to consider

Its 18-inch depth and height may be limiting for animals that require more floor area, deeper substrate or substantial climbing space.

Its suitability should be assessed against the adult animal’s specific requirements.

→ [Check the REPTI ZOO 67-Gallon Glass Terrarium on Amazon]

PVC Reptile Enclosures

PVC reptile enclosures use rigid plastic panels to form much of the enclosure, usually combined with viewing doors and purpose-designed ventilation.

They are available in various configurations, including larger horizontal habitats and tall enclosures designed to accommodate climbing structures.

PVC has become a popular option for larger reptile habitats because it combines relatively lightweight construction with useful insulating properties.

However, the quality and suitability of an enclosure depend on more than the material itself. Panel thickness, door construction, ventilation design and equipment compatibility all matter.

Advantages of PVC Reptile Enclosures

1. Good Heat Retention

Solid PVC panels generally provide better insulation than thin glass panels or open mesh.

This can help reduce heat loss and make it easier to maintain suitable temperatures, particularly in rooms where conditions fluctuate.

However, heating equipment and independent temperature monitoring are still necessary where required by the species.

2. Good Humidity Retention

The solid-sided construction of many PVC enclosures can help retain moisture.

This can be useful when maintaining the humidity conditions required by certain species, although actual humidity depends on ventilation, heating, substrate and room conditions.

Humidity retention should never come at the expense of adequate airflow.

3. Lower Weight Than Comparable Glass Designs

PVC construction can be easier to handle than an enclosure made predominantly from glass.

This becomes particularly relevant when choosing a larger habitat or planning where to position it.

The actual weight will still depend on the enclosure’s dimensions, panel thickness and other materials.

4. Greater Customization Potential

Depending on the model, PVC panels may make it easier to accommodate equipment and modifications.

Possible customization options include:

• Cable openings.
• Ventilation openings.
• Lighting and heating equipment.
• Secure mounting points.
• Shelves or climbing structures.
• Environmental monitoring equipment.

Any modification must preserve the enclosure’s structural integrity, prevent escapes and maintain safe equipment clearances.

Before drilling or altering a panel, check the manufacturer’s instructions and warranty conditions.

5. Large Enclosure Options

PVC is commonly used in larger purpose-built habitats, including the popular 4×2×2 format.

Solid-sided construction can be particularly practical as enclosure dimensions increase, although the appropriate size and layout must still be determined by the species’ needs.

6. Stackable Enclosure Systems

Some purpose-built PVC enclosure systems are designed to be stacked using manufacturer-approved supports or accessories.

This can help organize multiple habitats without requiring a separate floor-standing arrangement for every enclosure.

However, not every PVC enclosure is stackable. Never assume a model can safely support another enclosure unless the manufacturer explicitly approves that arrangement.

The supporting furniture, total weight, ventilation, heating and maintenance access must also be considered.

Disadvantages of PVC Reptile Enclosures

Less panoramic visibility

Many PVC enclosures have opaque sides and backs, so viewing is concentrated through the front doors.

Ventilation varies by model

A solid enclosure is not automatically well ventilated. Vent size and placement must be assessed carefully.

Construction quality varies

Panel thickness, fittings, door quality and assembly methods can differ considerably between manufacturers.

Larger models can be expensive

Although PVC can offer practical advantages, large or high-quality enclosures may require a substantial investment.

Assembly may be required

Some models are supplied as panels that need to be assembled, so it’s important to follow the manufacturer’s instructions carefully.

PVC Enclosure Pick: REPTI ZOO 120-Gallon PVC Reptile Enclosure

The REPTI ZOO 120-Gallon PVC Reptile Enclosure measures 48 × 24 × 24 inches, commonly described as a 4×2×2 reptile enclosure.

Compared with the glass model above, it provides a deeper footprint and greater height.

Its solid-sided PVC construction also makes it a useful example of an enclosure designed around environmental control and front viewing.

Key features

• 48 × 24 × 24-inch dimensions.
• Approximately 120-gallon nominal capacity.
• PVC enclosure construction.
• Horizontal 4×2×2 format.
• Front viewing area.

Why consider it?

This model is worth considering when a 4×2×2 layout meets the species’ enclosure requirements.

Its dimensions allow more room for appropriately arranged hides, furnishings and environmental zones than the smaller 36 × 18 × 18-inch PVC model.

The solid panels may also make it easier to retain heat and humidity than an open screen cage.

Things to consider

The 4×2×2 format is not suitable for every reptile. Some species require considerably more vertical space, a larger footprint or different ventilation arrangements.

Check the exact Amazon listing and manufacturer’s instructions for the door design, ventilation, assembly requirements and equipment-mounting options before purchasing.

→ [Check the REPTI ZOO 120-Gallon PVC Enclosure on Amazon]

Screen Reptile Enclosures

Screen reptile enclosures use mesh panels supported by a frame.

Unlike glass and PVC enclosures, their construction allows air to move relatively freely through the sides.

They are commonly available in tall configurations that can accommodate climbing structures, although suitability depends on the individual species.

Advantages of Screen Reptile Enclosures

Excellent ventilation

Mesh construction provides substantial ventilation and allows environmental conditions inside the enclosure to interact closely with the surrounding room.

Lightweight construction

Screen cages are often easier to move than comparable glass enclosures.

Vertical sizes available

Many screen enclosures are tall, providing room for suitable climbing branches, vines and other securely mounted furnishings.

Visibility

Mesh sides can provide views from multiple directions, although the mesh itself may be visible.

Lighting flexibility

Some screen designs can accommodate appropriate lighting arrangements, provided that equipment is installed according to the manufacturer’s instructions and the animal cannot contact hot or hazardous components.

Disadvantages of Screen Reptile Enclosures

Limited heat retention

Heat can escape quickly through the mesh, making room temperature an important consideration.

Limited humidity retention

Maintaining higher humidity may be challenging, particularly in a dry home.

Misting and water management

Water may pass through the mesh or collect around the enclosure if misting and drainage are not managed properly.

Greater influence from room conditions

The surrounding room’s temperature, humidity and airflow can have a substantial effect on the enclosure’s environment.

Mesh maintenance

Screen panels may require additional cleaning and should be inspected for damage or gaps.

Screen Enclosure Pick: Zoo Med ReptiBreeze Open Air Screen Cage

The Zoo Med ReptiBreeze Open Air Screen Cage is a purpose-built screen enclosure.

For this article, I’ve selected the 24 × 24 × 48-inch version.

Its tall configuration makes it a useful example of an enclosure that prioritizes vertical space and ventilation rather than the horizontal footprint offered by the two REPTI ZOO models.

Key features

• 24 × 24 × 48-inch dimensions.
• Open-air screen construction.
• Tall enclosure layout.
• Lightweight cage-style design.

Why consider it?

This model is worth examining for a species whose requirements can be met in a tall, highly ventilated habitat.

Its height provides space for an appropriately designed climbing environment, while the screen construction allows substantial air exchange.

Things to consider

A screen enclosure is not automatically suitable for every arboreal reptile.

Some species require environmental conditions that are difficult to maintain in an open-air cage, especially in a cold or dry room.

Before choosing this model, consider the species’ temperature, humidity, ventilation, adult size and climbing requirements.

→ [Check the Zoo Med ReptiBreeze 24×24×48 on Amazon]

Glass vs PVC vs Screen: Side-by-Side Comparison

The three products above illustrate how enclosure construction affects the habitat you can create.

Factor	Glass	PVC	Screen
Visibility	Excellent	Mainly through viewing doors	Through mesh panels
Insulation	Moderate	Generally good	Limited
Humidity retention	Depends on design	Generally good	Limited
Ventilation	Vent-dependent	Vent-dependent	Substantial
Weight	Relatively heavy	Often moderate	Generally light
Durability	Good but breakable	Depends on construction	Depends on frame and mesh
Customization	More limited	Often more flexible	Design-dependent
Large sizes	Available but heavy	Common	Available
Cleaning	Usually easy	Usually easy	Mesh requires more attention
Bioactive potential	Good with suitable design	Good with suitable design	Possible, design-dependent

Comparing the Three Featured Amazon Products

Product	Material	Dimensions	Main Design Characteristic
REPTI ZOO 67-Gallon Terrarium	Glass	48 × 18 × 18 in	Long horizontal glass habitat
REPTI ZOO 120-Gallon Enclosure	PVC	48 × 24 × 24 in	Larger solid-sided 4×2×2 habitat
Zoo Med ReptiBreeze	Screen	24 × 24 × 48 in	Tall, highly ventilated cage

These products are not interchangeable.

The REPTI ZOO glass model emphasizes clear viewing and front access. The PVC model provides a larger horizontal footprint with solid-sided construction, while the ReptiBreeze emphasizes vertical space and ventilation.

When comparing them, focus on whether the dimensions, layout and environmental characteristics meet the requirements of your particular reptile.

Which Reptile Enclosure Type Should You Choose?

The right enclosure material depends on the environment you need to create and the space required by your reptile.

Consider Glass If…

• Clear visibility is particularly important.
• The required enclosure size remains manageable.
• You want an attractive display enclosure.
• The species’ temperature and humidity requirements can be maintained effectively in glass.

Consider PVC If…

• You need a larger solid-sided enclosure.
• Reducing heat loss is important.
• You need to retain humidity more readily.
• You want greater equipment-customization flexibility.
• Weight is becoming an issue.
• You’re considering a manufacturer-approved stackable enclosure system.

Consider Screen If…

• Substantial airflow is an important husbandry requirement.
• Your room conditions make temperature management practical.
• Vertical space is important.
• You can maintain the required humidity.
• The species’ needs are compatible with an open-air design.

There is no universally best reptile enclosure material. The appropriate choice is the enclosure that allows you to safely provide the environmental and behavioral conditions required by your particular species.

Arboreal vs Terrestrial vs Burrowing Reptiles

Enclosure material is only one part of the decision. The shape and internal layout must also suit the animal’s natural behavior.

Reptile lifestyle	Main priority	Important features
Arboreal	Vertical space	Secure climbing branches, elevated furnishings and suitable height
Terrestrial	Floor space	Adequate ground area, hides and room for a temperature gradient
Burrowing	Substrate depth and floor space	Appropriate substrate, secure furnishings and room to dig

A tall screen enclosure and a long PVC enclosure may have very different usable layouts, even when their advertised capacities appear similar.

Choosing PVC doesn’t automatically mean choosing a horizontal enclosure, just as choosing screen doesn’t automatically mean that the enclosure is suitable for every climbing species.

Always assess the requirements of the particular species rather than assuming that one enclosure shape suits all animals within a broad category.

What Does 4×2×2 Mean for a Reptile Enclosure?

A 4×2×2 reptile enclosure measures:

• 4 feet long
• 2 feet deep
• 2 feet high

In inches, that’s 48 × 24 × 24 inches.

This format provides a horizontal footprint of eight square feet, along with two feet of internal height before allowing for the actual wall thickness, floor construction and fittings.

The REPTI ZOO 120-Gallon PVC Enclosure featured above is an example of this format.

A 4×2×2 enclosure is a common shopping category, but its suitability depends on the animal’s adult size and husbandry requirements. It should not be treated as a universal minimum or maximum enclosure size.

Front-Opening vs Top-Opening Reptile Enclosures

Door design affects how easily you can access and maintain the habitat.

Front-Opening Enclosures

Front-opening doors can make feeding, spot-cleaning, water replacement and furnishing adjustments more convenient.

They can also reduce the need to reach down into the enclosure from above. However, door security and the risk of escape during access still need to be considered.

Top-Opening Enclosures

Top-opening designs may work for certain setups, but access can become less convenient in large or heavily furnished habitats.

Regardless of the opening style, check that the doors or lid close securely and that the animal cannot exploit gaps or loose fittings.

How to Choose the Right Reptile Enclosure Size

Start with the reptile’s expected adult size rather than choosing an enclosure solely for its current juvenile dimensions.

Then consider its normal behavior and environmental requirements.

A suitable enclosure must provide enough room for movement and the necessary furnishings without overcrowding the habitat.

Depending on the species, you may need space for:

• A warm area and cooler retreat.
• Appropriately sized hides.
• Secure climbing branches or platforms.
• Suitable substrate depth.
• A water dish or other water provision.
• UVB and heating equipment at safe distances.
• Feeding and maintenance access.

Check reliable, species-specific husbandry guidance before settling on dimensions. Advertised gallon capacity alone does not tell you whether an enclosure has the correct footprint or height.

Heat and Humidity: Which Material Is Easier to Control?

Enclosure material can influence how much heating or humidification is required, but the surrounding room and equipment also play important roles.

Glass Enclosures

Glass provides a physical barrier that helps contain the habitat, but it generally offers less insulation than solid PVC panels.

The amount of heat and moisture retained will depend on the enclosure’s size, ventilation and heating arrangement.

PVC Enclosures

Solid PVC panels can reduce heat transfer and moisture loss. This can be helpful when maintaining the environmental conditions required by certain species.

However, humidity retention must not come at the expense of adequate ventilation.

Screen Enclosures

Screen cages exchange air readily with the surrounding room. As a result, the room’s temperature and humidity have a substantial influence on conditions inside the enclosure.

A screen cage may require a different environmental-control strategy from a solid-sided terrarium.

Do You Need a Humidifier?

Not every reptile enclosure requires a humidifier.

First, establish the humidity range and daily conditions appropriate for your species, then measure the actual conditions inside the enclosure.

If humidity remains consistently below the required range, investigate ventilation, room conditions and the species’ water and substrate needs before adding equipment.

For supplementary information about humidifier capacity, external sensors and automatic humidity control, see my guide to the best humidifiers for grow tents.

That guide covers plant grow-tent equipment rather than reptile-specific husbandry, so any humidifier used for animal housing must be suitable for the particular enclosure and species.

Regardless of the material or equipment you choose, establish and monitor the correct environmental conditions before introducing your reptile.

Can You Make a Reptile Enclosure Bioactive?

A bioactive enclosure uses a suitable substrate and living organisms, such as plants and an appropriate cleanup crew, to create a more complex habitat.

Glass and PVC enclosures can both accommodate bioactive setups when their construction and the species’ requirements allow it.

Important considerations include:

• Substrate composition and depth.
• Drainage where necessary.
• Suitable live plants.
• Leaf litter where appropriate.
• Moisture management.
• Ventilation.
• Secure placement of heavy furnishings.
• Compatibility between the animal and the chosen organisms.

Screen enclosures may also accommodate planted setups, but substrate containment, drainage and moisture management require particular attention.

A bioactive setup still needs regular monitoring, cleaning and maintenance. It should not be treated as a self-maintaining habitat.

Purpose-Built Reptile Enclosure vs Grow Tent

Purpose-built reptile enclosures are designed around animal housing, while grow tents are manufactured primarily for cultivating plants.

A grow tent may offer generous space, but adapting one for reptiles introduces additional considerations.

Factor	Purpose-Built Reptile Enclosure	Adapted Grow Tent
Intended use	Animal housing	Plant cultivation
Visibility	Usually purpose-designed	Often limited
Ventilation	Depends on reptile enclosure design	Requires assessment and possible modification
Escape prevention	Animal containment is part of the design	Openings and seams require careful assessment
Equipment installation	Often accommodates reptile equipment	Requires additional planning
Modification	Depends on the model	Often necessary

A purpose-built enclosure is generally the more straightforward starting point because its doors, access and construction are intended for animal housing.

A grow tent can provide substantial space and customization, but it requires more adaptation because it wasn’t originally designed for animal housing.

Reptile Enclosure Buying Checklist

Before purchasing an enclosure, check the following:

• The dimensions suit the animal’s adult size.
• The footprint or height accommodates its normal behavior.
• There is room for suitable hides and furnishings.
• The design supports the required temperature gradient.
• Ventilation is appropriate for the species.
• Humidity can be maintained and monitored.
• Heating equipment can be installed safely.
• UVB and other lighting can be positioned correctly.
• Doors, vents and cable openings are secure.
• The enclosure can accommodate the required substrate depth.
• Materials and surfaces can be cleaned appropriately.
• The enclosure fits on a suitable, stable support.
• Replacement parts and manufacturer instructions are available.

It is also worth checking the product’s actual internal dimensions, as the usable space may be slightly smaller than the advertised external measurements.

Frequently Asked Questions

Is PVC or glass better for reptile enclosures?

Both can be suitable, depending on the species and enclosure design. PVC generally provides better insulation and can help retain humidity, while glass offers excellent visibility and easy-to-clean surfaces. The enclosure’s dimensions, ventilation and equipment compatibility are equally important.

Do PVC reptile enclosures hold heat better than glass?

Solid PVC panels generally provide better insulation than thin glass panels. However, actual temperatures depend on the enclosure’s construction, ventilation, heating equipment and surrounding room conditions.

Are screen enclosures good for reptiles?

Screen enclosures can be appropriate for species whose husbandry requirements are compatible with their high ventilation. However, they may be difficult to heat or humidify in cold or dry rooms. Species-specific requirements should guide the decision.

What is the best material for a reptile enclosure?

There is no single material that suits every reptile. Glass, PVC and screen each have different characteristics. Choose the material and enclosure design that allow you to provide the necessary space, temperature, humidity, ventilation, lighting and security.

What does a 4×2×2 reptile enclosure mean?

It refers to an enclosure measuring four feet long, two feet deep and two feet high, equivalent to 48 × 24 × 24 inches.

Are front-opening reptile enclosures better?

Front-opening enclosures can make routine feeding, cleaning and maintenance more convenient. However, a secure top-opening design may also be suitable for some setups. The best access arrangement depends on the animal and enclosure layout.

Can you use an aquarium as a reptile enclosure?

Some aquarium-style tanks can be adapted for certain reptiles, but their dimensions, ventilation, access and equipment compatibility must be assessed carefully. A purpose-built reptile enclosure may offer a more convenient starting point.

Can you use a grow tent instead of a reptile enclosure?

A grow tent may be adaptable for certain species, but it is not a purpose-built reptile habitat. Heating, ventilation, UVB, escape prevention and equipment mounting all require careful assessment and, potentially, modification.

Final Thoughts: Glass vs PVC vs Screen Reptile Enclosures

Glass, PVC and screen reptile enclosures offer different advantages. Glass provides clear viewing and straightforward cleaning, PVC can make insulation and humidity management easier, and screen construction offers substantial ventilation.

The REPTI ZOO glass and PVC enclosures and the Zoo Med ReptiBreeze featured in this guide illustrate these different approaches, but their dimensions and designs serve different needs.

Before buying, start with your reptile’s adult size, natural behavior and species-specific environmental requirements. Then choose an enclosure that allows you to provide those conditions safely, consistently and with enough room for the animal’s normal activities.