Skip to content
Vet RanchVet Ranch
  • Home
  • Pet Animals
    • Dog
      • Dog Crate
      • Dog House
      • Dog Nail
      • Dog Shampoo
      • Dog Bed
      • Dog Harness
      • Dog Door
      • Dog Muzzles
      • Dog Car Seat
      • Dog Feeder
      • Dog Harness
      • Dog Kennel
      • Dog Pen
    • Cat
      • Cat Carrier
      • Cat Clipper
      • Cat Couch
      • Cat exercise wheel
      • Cat Litter
      • Cat Litter Box
      • Cat scratching post
      • Cat stroller
      • Cat Tracker
      • Cat Tree
      • Cat Vacuum
    • Bird
      • Bird Camera Feeder
      • Bird Stand
      • Bird Bath
      • Bird Cage
      • Bird Crate
      • Bird Feeder
      • Bird Seed
    • Rabbit
      • Rabbit Cage
      • Rabbit Hutch
    • Fish
      • Fish Tank
      • Fish Aquarium
    • Pet Stroller
  • Knowledge
    • Best Product
    • Review
    • Blog
  • About Us
  • Contact Us
  • Write for Us
Vet RanchVet Ranch
  • Home » 
  • Bearded Dragon » 
  • Mobile Bearded Dragon Enclosure

Mobile Bearded Dragon Enclosure

Arthur Crowley September 11, 2023

Bearded dragons are fascinating family pets for reptile enthusiasts. They are recognized to be excellent animals because of their pleasant actions as well as strength. If you’re a bearded dragon proprietor, you understand that providing your family pet with a comfortable and also risk-free setting is vital. A appropriate enclosure can aid manage the temperature and also humidity degrees, give them the space they require to move around, and also protect against any potential risks. In this blog post, we’ll guide you via the building and construction of the Mobile Bearded Dragon Enclosure bearded dragon unit.

Contents
  1. Mobile Bearded Dragon Enclosure – Complete Review And Purchasing Guide
    1. Reptile Habitats 4x2x2 (120 Gallon) Bearded Dragon Enclosure V2 PVC Panels, Glass Doors, Lightweight, Easy to Assemble, Heavy Duty Screen, Aluminum Frame
      1. Features
    2. 40 Gallon Reptile Tank with Storage Cabine,Bearded Dragon Tank with Stand,Reptile Enclosure with Sturdy Locks, Heat-Resistant Mesh Top, Adjustable Cabinet and 4 Wheels
      1. Features
    3. 80 Gallon Large Reptile Tank – 4x2x2 Enclosure with Mesh Top, Acrylic Panels & Wood Frame – Bearded Dragon Cage, Snake Enclosure, Reptile Habitat for Lizard, Gecko
      1. Features
    4. Miniature Reptile Rock Climbing Wall – Enclosure Enrichment for Bearded Dragons, Geckos, and Small Pets – Fun Activity and Habitat Décor
      1. Features
    5. PINVNBY Plastic Reptile Feeding Box with Wheels,Reptiles Breeding Enclosure Cages Transparent Amphibians Habitat Terrarium Tank Portable Transport Container for Lizard,Bearded Dragon(Blue)
      1. Features
    6. Bearded Dragon Tank with Legs Up to 77 Gallons, Tortoise Habitat with Metal Mesh Top, Reptile Enclosure Lockable Design, Snake Tank (Black, 62 Gallon, 40" L x 20" W x 47.6" H)
      1. Features
    7. Reptile Tank 44''x20''x20'' ToxiRium Large PVC Reptile Enclosure 76 Gallons for Bearded Dragon Gecko Lizard Snake, Wide Lounge Vivarium Area with Sliding Doors Lock
      1. Features
  2. Exactly how to Develop the Unit for Bearded Dragon
  3. Verdict:

Mobile Bearded Dragon Enclosure – Complete Review And Purchasing Guide

Check out our top products that you can purchase:

1
Reptile Habitats 4x2x2 (120 Gallon) Bearded Dragon Enclosure V2 PVC Panels, Glass Doors, Lightweight, Easy to Assemble, Heavy Duty Screen, Aluminum Frame
✓ Best choice
Reptile Habitats 4x2x2 (120 Gallon) Bearded Dragon Enclosure V2 PVC Panels, Glass Doors,...
BUY NOW Amazon.com
9.9
BUY NOW
Amazon.com
2
40 Gallon Reptile Tank with Storage Cabine,Bearded Dragon Tank with Stand,Reptile Enclosure with Sturdy Locks, Heat-Resistant Mesh Top, Adjustable Cabinet and 4 Wheels
40 Gallon Reptile Tank with Storage Cabine,Bearded Dragon Tank with Stand,Reptile Enclosure with...
BUY NOW Amazon.com
9.5
BUY NOW
Amazon.com
3
80 Gallon Large Reptile Tank – 4x2x2 Enclosure with Mesh Top, Acrylic Panels & Wood Frame – Bearded Dragon Cage, Snake Enclosure, Reptile Habitat for Lizard, Gecko
High quality
80 Gallon Large Reptile Tank – 4x2x2 Enclosure with Mesh Top, Acrylic Panels & Wood Frame –...
BUY NOW Amazon.com
9.3
BUY NOW
Amazon.com
4
Miniature Reptile Rock Climbing Wall – Enclosure Enrichment for Bearded Dragons, Geckos, and Small Pets – Fun Activity and Habitat Décor
Miniature Reptile Rock Climbing Wall – Enclosure Enrichment for Bearded Dragons, Geckos, and...
BUY NOW Amazon.com
9.2
BUY NOW
Amazon.com
5
PINVNBY Plastic Reptile Feeding Box with Wheels,Reptiles Breeding Enclosure Cages Transparent Amphibians Habitat Terrarium Tank Portable Transport Container for Lizard,Bearded Dragon(Blue)
PINVNBY Plastic Reptile Feeding Box with Wheels,Reptiles Breeding Enclosure Cages Transparent...
BUY NOW Amazon.com
8.5
BUY NOW
Amazon.com
6
Bearded Dragon Tank with Legs Up to 77 Gallons, Tortoise Habitat with Metal Mesh Top, Reptile Enclosure Lockable Design, Snake Tank (Black, 62 Gallon, 40" L x 20" W x 47.6" H)
Bearded Dragon Tank with Legs Up to 77 Gallons, Tortoise Habitat with Metal Mesh Top, Reptile...
BUY NOW Amazon.com
8.5
BUY NOW
Amazon.com
7
Reptile Tank 44''x20''x20'' ToxiRium Large PVC Reptile Enclosure 76 Gallons for Bearded Dragon Gecko Lizard Snake, Wide Lounge Vivarium Area with Sliding Doors Lock
Reptile Tank 44''x20''x20'' ToxiRium Large PVC Reptile Enclosure 76 Gallons for Bearded Dragon...
BUY NOW Amazon.com
8.4
BUY NOW
Amazon.com

*Note: The score is based on our AI score (Editor’s choice and rating).
Reptile Habitats 4x2x2 (120 Gallon) Bearded Dragon Enclosure V2 PVC Panels, Glass Doors, Lightweight, Easy to Assemble, Heavy Duty Screen, Aluminum Frame

Reptile Habitats 4x2x2 (120 Gallon) Bearded Dragon Enclosure V2 PVC Panels, Glass Doors, Lightweight, Easy to Assemble, Heavy Duty Screen, Aluminum Frame

$343.85  in stock
4 new from $343.85
BUY NOW
Amazon.com
as of November 21, 2025 5:47 am

Features

  • Easy to assemble in less than 30 minutes.
  • Durable PVC panels and heavy duty screen.
  • Isn’t damaged by high humidity.
  • Lightweight and easy to move, weighing only 25 lbs.
  • Ideal for many terrestrial lizards
40 Gallon Reptile Tank with Storage Cabine,Bearded Dragon Tank with Stand,Reptile Enclosure with Sturdy Locks, Heat-Resistant Mesh Top, Adjustable Cabinet and 4 Wheels

40 Gallon Reptile Tank with Storage Cabine,Bearded Dragon Tank with Stand,Reptile Enclosure with Sturdy Locks, Heat-Resistant Mesh Top, Adjustable Cabinet and 4 Wheels

$179.99  in stock
BUY NOW
Amazon.com
as of November 21, 2025 5:47 am

Features

  • [Durable & Spacious Design] Crafted from durable New Zealand pine and multi-ply panels, this 40 gallon reptile tank ensures long-lasting strength and stability.The viewing section of this reptile tank utilizes reinforced PVC panels with impact-resistant and scratch-resistant safety features, ensuring a non-toxic habitat for snakes, lizards,bearded dragon and other reptiles.
  • [Ideal for New Owners​​] This 40 gallon reptile tank is space-efficient and ideal for beginners, making it a perfect choice for those with limited space or new to reptile care. It's well-suited for housing juvenile bearded dragons, leopard geckos, corn snakes, or other small reptiles.TIP: This tank is not suitable for holding water.
  • [Superior Ventilation & Vision] The snake tank includes a heat-resistant metal mesh top and multi-directional vents, providing excellent airflow for species like bearded dragons and lizards. Designed for observation, the reptile enclosure features over 92% light transmittance for optimal visibility of your pet’s habitat.
  • [Easy Mobility & Storage] Featuring 4 universal wheels, this lizard tank allows effortless movement and repositioning. The adjustable storage cabinet offers convenient space for accessories, easily store all your reptile care essentials—UVB lamps, heating mats, thermometers, substrate, snacks, and tools—in one organized space.
  • [Easy To Assemble] With clear instructions and labeled parts, setup is quick and hassle-free. Backed by responsive customer support, this 40 gallon reptile tank delivers great value and premium quality.
80 Gallon Large Reptile Tank – 4x2x2 Enclosure with Mesh Top, Acrylic Panels & Wood Frame – Bearded Dragon Cage, Snake Enclosure, Reptile Habitat for Lizard, Gecko

80 Gallon Large Reptile Tank – 4x2x2 Enclosure with Mesh Top, Acrylic Panels & Wood Frame – Bearded Dragon Cage, Snake Enclosure, Reptile Habitat for Lizard, Gecko

$169.99  in stock
BUY NOW
Amazon.com
as of November 21, 2025 5:47 am

Features

  • Spacious 80-Gallon Reptile Enclosure Measuring 47.2" x 21.2" x 20", this large reptile tank offers a generous habitat for reptiles such as bearded dragons, snakes, and geckos. The 4x2x2 reptile enclosure size allows plenty of room for basking, climbing, and hiding, promoting a healthy and active lifestyle.
  • Transparent Acrylic Visibility on All Sides: Designed with four clear acrylic panels, this reptile habitat ensures maximum visibility and interaction. Owners can easily monitor their pet’s behavior while pets enjoy an unobstructed view of their surroundings — ideal for stress-free environments.
  • Ventilated Mesh Flip-Top Lid: The flip-top mesh lid provides excellent airflow, helping regulate humidity and temperature. It also ensures UVB lighting penetrates effectively, making it ideal for use with heat lamps or full-spectrum lights. The secure latch prevents escape for peace of mind.
  • Durable Natural Wood Frame & Easy Maintenance: Built with solid wood, this bearded dragon enclosure is both eco-friendly and stable. The smooth surfaces and wide access points make cleaning and feeding hassle-free, while the deep acrylic base contains substrate securely without leaks.
  • Quick Assembly with Clear Instructions: All hardware and tools are included for fast and easy setup. Whether used as a snake terrarium, bearded dragon tank, or large reptile enclosure, this habitat combines style, function, and comfort for both pets and owners.
Miniature Reptile Rock Climbing Wall – Enclosure Enrichment for Bearded Dragons, Geckos, and Small Pets – Fun Activity and Habitat Décor

Miniature Reptile Rock Climbing Wall – Enclosure Enrichment for Bearded Dragons, Geckos, and Small Pets – Fun Activity and Habitat Décor

$8.99  in stock
BUY NOW
Amazon.com
as of November 21, 2025 5:47 am

Features

  • Human-Inspired Reptile Climbing Wall – Modeled after a rock gym, this fun and functional wall brings humor and enrichment to your reptile's enclosure.
  • Interactive and Engaging Design – Encourages climbing and exploration, promoting exercise and natural behaviors in bearded dragons, geckos, and other small pets.
  • ️ Durable, Pet-Safe Materials – Made from sturdy, non-toxic materials to ensure your pet can climb and play safely.
  • Unique and Eye-Catching Décor – Combines a playful design with practicality, making your reptile's habitat stand out with personality.
  • Perfect for Reptile Lovers with a Sense of Humor – A great gift for pet owners who want to combine functionality and fun in their enclosure setup.
PINVNBY Plastic Reptile Feeding Box with Wheels,Reptiles Breeding Enclosure Cages Transparent Amphibians Habitat Terrarium Tank Portable Transport Container for Lizard,Bearded Dragon(Blue)

PINVNBY Plastic Reptile Feeding Box with Wheels,Reptiles Breeding Enclosure Cages Transparent Amphibians Habitat Terrarium Tank Portable Transport Container for Lizard,Bearded Dragon(Blue)

$39.28  in stock
BUY NOW
Amazon.com
as of November 21, 2025 5:47 am

Features

  • Clever Design:Portable small snake terrarium is designed with multiple small air holes for ventilation there is a breathable panel mesh cover on the top,can be opened,closed,and disassembled,ventilation and breathability,ensuring air circulation in the internal habitat,multiple vents at the bottom and sides allowing pets to breathe fresh air. front panel can be opened or closed,convenient cleaning of pet houses,four rolling pulleys at the bottom,carrying out, and not easily broken
  • Appropriate Size:Transparent reptile breeding box size is:15.6x11.6x 9.5 inch/39.62x29.46x24.13 cm. There is enough crawling space to move around,small and lightweight,easy to carry and move. Reptile cage safety lock on the upper cover,it can prevent pets from escaping.allowing light and ultraviolet rays to penetrate,there is a feeding port above the lidconvenient feeding,with a dual opening design 360 degree observation of small animal behavior
  • Quality Material:Reptile feeding box is made of high quality plastic material,safe and sturdy,good transparency,durable,and not easy to break even if it is bitten or scratched by reptile,cages can be used safely for a long time. for pet hatching, small pet breeding box, temporary breeding or outdoor transportation and carrying
  • Wide Application: Habitat mini pet breeding cage for very suitable for small reptiles and amphibians,including snakes, turtles, lizards,geckos,hermit crabs,bearded dragon,chameleons,scorpion,frogs,centipedes,snails and insects,providing them with a clean and safe comfort environment and space
  • Better Experience:We are committed to our customer's satisfaction & buy with confidence. 100% money-back promise or replacement. If you ever have an issue,you are always the most welcome to contact us. Thank you for your purchase and support!
Bearded Dragon Tank with Legs Up to 77 Gallons, Tortoise Habitat with Metal Mesh Top, Reptile Enclosure Lockable Design, Snake Tank (Black, 62 Gallon, 40" L x 20" W x 47.6" H)

Bearded Dragon Tank with Legs Up to 77 Gallons, Tortoise Habitat with Metal Mesh Top, Reptile Enclosure Lockable Design, Snake Tank (Black, 62 Gallon, 40" L x 20" W x 47.6" H)

$178.99  in stock
BUY NOW
Amazon.com
as of November 21, 2025 5:47 am

Features

  • 【Premium Reptile Habitat】For reptile enthusiasts looking for the best living space for their scaly pets, our premium reptile enclosure is an outstanding option. Made from high-quality solid wood coated with waterproof polyester and reinforced with acrylic elements, this habitat ensures a secure and comfortable environment for your scaly companions. Please note, this enclosure is specifically designed for terrestrial reptiles and is not suitable for aquatic use.Note: Items Inside of the cage are NOT included.
  • 【Spacious Interior】Available in 4 sizes ranging from 24 to 48 inches in length, with generous 24-inch legs height, each enclosure offers ample room for your reptiles to explore and thrive. Refer to picture 2 for detailed size information to choose the perfect fit for your pet. The transparent acrylic side panels provide an unobstructed view of your pets' daily activities, while an additional acrylic sheet at the bottom simplifies maintenance and protects against accidental spills.
  • 【Functional Design】Our terrarium is thoughtfully designed with a user-friendly layout. The double sliding front doors glide effortlessly and feature a secure locking mechanism to ensure your pets remain safe and secure. The top is equipped with durable metal mesh for optimal airflow, ideal for positioning heat lamps and UVA/B lights (not included) to maintain precise environmental conditions.
  • 【Effortless Assembly】Assembling your reptile's new habitat is a breeze with our comprehensive instruction manual and included accessories. Even for those with minimal DIY experience, setting up the enclosure is quick and straightforward, ensuring your scaly friends can settle into their new home without delay.
  • 【Clear Instructions】The enclosure arrives with clear instructions and all required hardware, making assembly straightforward—even for first-time pet owners. You'll have your reptile's new habitat ready in no time, so they can enjoy their environment right away.
Reptile Tank 44''x20''x20'' ToxiRium Large PVC Reptile Enclosure 76 Gallons for Bearded Dragon Gecko Lizard Snake, Wide Lounge Vivarium Area with Sliding Doors Lock

Reptile Tank 44''x20''x20'' ToxiRium Large PVC Reptile Enclosure 76 Gallons for Bearded Dragon Gecko Lizard Snake, Wide Lounge Vivarium Area with Sliding Doors Lock

$269.99  in stock
2 new from $269.99
Free shipping
BUY NOW
Amazon.com
as of November 21, 2025 5:47 am

Features

  • 【Large Reptile Habitat Enclosure】: With spacious dimensions of 44"x20"x20" and an equivalent capacity of 76 gallons, Toxirium reptile habitat offers ample room for reptiles to explore, hide, rest, and feel secure. The generous feeding area allows you to craft a comfortable and enriching environment for your reptile companion.
  • 【Sturdy PVC Enclosure with Support Bars】: Equipped with support bars on the top screen, Toxirium reptile tank ensures secure placement of lighting fixtures without the risk of falling. The bottom panel also features support bars, guaranteeing stability even when adding decorations weighing up to 104 lbs.
  • 【Enhanced Heat and Humidity Retention】: Unlike glass enclosures, Toxirium PVC reptile cage minimizes heat loss due to its lower conductivity. The insulation properties make it energy-efficient, reducing the energy needed to maintain optimal temperatures and leading to potential long-term cost savings.
  • 【Stackable and Lightweight Design】: The stackable configuration makes it perfect for you setting up multiple reptile habitats in the same area. Thanks to the inherent lightweight nature of PVC enclosures, relocating or reorganizing them becomes hassle-free.
  • 【Thrive for variety reptiles】: Toxirium terrarium provide good insulation, make it easy to clean and can maintain proper humidity levels. It's a perfect choice to create a comfortable environment for a wide range of desert-dwelling reptiles.such as:bearded dragons,ball pythons,leopard geckos,desert lizards,sand boas,small desert tortoises etc

Exactly how to Develop the Unit for Bearded Dragon

The very first step in constructing the excellent unit for your bearded dragon is picking the Mobile Bearded Dragon Enclosure materials. You’ll want to use strong products like without treatment timber, PVC, or acrylic sheets that won’t break down gradually. The ideal size is around 75-120 gallons for adults as well as a minimum of 40-50 gallons for juveniles. You’ll also require to set up a warmth lamp and also UV light to produce a basking location as well as nourish their vitamin D needs.

Second of all, you’ll need to set up the substratum, which is the bedding or floor covering for the unit. Popular alternatives consist of reptile carpeting, tile, or artificial turf. Whatever material you choose, ensure it is safe for bearded dragons as well as easy to tidy to prevent any kind of wellness concerns.

Finally, placing decors in their enclosure will give your animal a complacency and supply them with a appropriate environment. Adding rocks, branches, as well as other hiding places can help them really feel a lot more comfy. Nevertheless, make sure that the decors are safe and also do not provide any choking hazards or threat of hurting your animal.

Additionally, managing the temperature level as well as humidity levels within the unit is vital. Bearded dragons need temperature levels between 90-110 degrees Fahrenheit and a decrease to 70-85 levels Fahrenheit during the night. You’ll require to set up a thermometer as well as hygrometer to track the temperature and also humidity. By managing the temperature and also humidity, you’ll guarantee your pet dog’s health and protect against any type of possible breathing or digestive problems.

Finally, maintaining the enclosure is vital to maintaining your bearded dragon healthy and balanced and also satisfied. You’ll need to clean up the room on a regular basis and also change the bed linen roughly twice a month as it can gather microorganisms as well as emit smells. Likewise, guarantee that you get rid of any type of leftover food and also feces daily to prevent any kind of health problems.

Verdict:

Building an remarkable bearded dragon unit can be a satisfying experience in supplying your family pet with a comfortable and also risk-free life. It’s necessary to take into consideration products, substrate, decorations, temperature level, and moisture degrees on a regular basis to ensure your pet dog remains healthy and balanced. Keeping the room is also important to shield your animal from any kind of risk of injury. By following the suggestions in this post, you’ll have a happy, healthy and balanced, and well-adjusted bearded dragon. Offering your animal the perfect environment will certainly allow them to thrive both literally and also emotionally.

Share
facebookShare on FacebooktwitterShare on TwitterpinterestShare on Pinterest
linkedinShare on LinkedinvkShare on VkredditShare on ReddittumblrShare on TumblrviadeoShare on ViadeobufferShare on BufferpocketShare on PocketwhatsappShare on WhatsappviberShare on ViberemailShare on EmailskypeShare on SkypediggShare on DiggmyspaceShare on MyspacebloggerShare on Blogger YahooMailShare on Yahoo mailtelegramShare on TelegramMessengerShare on Facebook Messenger gmailShare on GmailamazonShare on AmazonSMSShare on SMS
Post navigation
Previous post

Building Instructions Bearded Dragon Enclosure

Next post

Bearded Dragon 120 Gallon Enclosure Lighting

Arthur Crowley

Arthur Crowley

To provide you with the expert assistance you need, Vet Ranch with licensed veterinarians can answer your health-related pet issues.

For the purpose of sharing knowledge with each other, we have jointly created this website, where you can get useful information from us and also where we expand our knowledge through your comments from you.

Related Posts

Mobile Bearded Dragon Enclosure

Bearded Dragon Tanks And Accessories

Mobile Bearded Dragon Enclosure

Bearded Dragon Accessories Leash

Mobile Bearded Dragon Enclosure

Price Of Bearded Dragon And Accessories

Mobile Bearded Dragon Enclosure

Looking For Bearded Dragon With Accessories

Mobile Bearded Dragon Enclosure

Enclosure Size For Single Bearded Dragon

Mobile Bearded Dragon Enclosure

3d Print Accessories For Bearded Dragon

Mobile Bearded Dragon Enclosure

Custom Build A Proper Bearded Dragon Enclosure

Mobile Bearded Dragon Enclosure

Best Accessories For My Bearded Dragon

Affiliate disclaimer

Vet Ranch (vetranch.org) is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.

Amazon and the Amazon logo are trademarks of Amazon.com, Inc, or its affiliates.

Affiliate Disclaimer

Vet Ranch (vetranch.org) is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Amazon and the Amazon logo are trademarks of Amazon.com, Inc, or its affiliates.

Category

Best Product

Review

Blog

Page

  • About Us
  • Contact Us
  • Affiliate Disclaimer
  • Privacy Policy

Follow us on social

VET RANCH LOGO
FacebookFacebookTwitterInstagramYoutubeYoutube
Copyright © 2025 Vet Ranch
Your privacy

By selecting "Accept all cookies," you consent to Vetranch storing cookies on your device and disclosing information in accordance with our Privacy policy

Menu
  • Home
  • Pet Animals
    • Dog
      • Dog Crate
      • Dog House
      • Dog Nail
      • Dog Shampoo
      • Dog Bed
      • Dog Harness
      • Dog Door
      • Dog Muzzles
      • Dog Car Seat
      • Dog Feeder
      • Dog Harness
      • Dog Kennel
      • Dog Pen
    • Cat
      • Cat Carrier
      • Cat Clipper
      • Cat Couch
      • Cat exercise wheel
      • Cat Litter
      • Cat Litter Box
      • Cat scratching post
      • Cat stroller
      • Cat Tracker
      • Cat Tree
      • Cat Vacuum
    • Bird
      • Bird Camera Feeder
      • Bird Stand
      • Bird Bath
      • Bird Cage
      • Bird Crate
      • Bird Feeder
      • Bird Seed
    • Rabbit
      • Rabbit Cage
      • Rabbit Hutch
    • Fish
      • Fish Tank
      • Fish Aquarium
    • Pet Stroller
  • Knowledge
    • Best Product
    • Review
    • Blog
  • About Us
  • Contact Us
  • Write for Us
FacebookTwitterPinterest