What is a Bolivian Orange Bellied Tarantula (OBT)?
The Bolivian Orange Bellied Tarantula, often abbreviated as OBT, is a captivating species that has gained popularity among tarantula enthusiasts. Native to Bolivia, this tarantula is known for its striking appearance and relatively manageable care requirements, making it a good choice for beginners. These fascinating creatures belong to the Grammostola genus and are primarily terrestrial, meaning they spend most of their time on the ground. Their vibrant coloration, combined with their unique behaviors, provides a rewarding experience for those looking to delve into the world of invertebrate pets. Learning about OBTs involves understanding their origins, their natural habitats, and their specific needs to ensure their health and well-being in captivity. Getting started can be easy with the right information and care.
Appearance and Characteristics
The Bolivian Orange Bellied Tarantula’s appearance is one of its most alluring traits. The OBT’s most striking feature is its vibrant coloration. They typically display a dark brown or black carapace and legs, contrasted by bright orange hairs on their abdomen. These vivid colors give them a distinct and eye-catching look. The size of the OBT can vary depending on its age and gender, but they generally grow to be of medium size, with a leg span of up to 5-6 inches. Their overall build is robust, and they possess the typical tarantula features, including eight legs, two pedipalps used for sensory and food manipulation, and two chelicerae, which are the fangs used for injecting venom. Overall the OBT is a beautiful creature.
Size and Lifespan of OBT

Understanding the size and lifespan of your OBT is essential for providing proper care and setting realistic expectations. As mentioned, mature OBTs typically have a leg span ranging from 5 to 6 inches. The males tend to be slightly smaller than the females. In terms of lifespan, female OBTs can live for a considerable amount of time, often between 10 to 15 years, sometimes even longer with optimal care. Males, however, have a shorter lifespan, typically living for only a few years after reaching maturity. The significant difference in longevity emphasizes the importance of considering the sex of the tarantula when acquiring one. Knowing the life stage of your OBT helps you plan for its future housing and care needs.
Temperament and Handling
The temperament of an OBT is generally considered to be relatively docile compared to some other tarantula species, but this does not mean they are naturally friendly. They are known to be skittish and can be defensive if they feel threatened. When startled, they may flick urticating hairs from their abdomen, which can cause skin irritation, and they might also adopt a defensive posture, raising their front legs and fangs. It’s best to observe the tarantula’s behavior and avoid any actions that might stress it. Handling is possible, but it’s best to avoid it unless absolutely necessary, such as during enclosure maintenance or health checks. Building a relationship with your OBT depends on the individual and requires patience. It is essential to respect the tarantula’s space and understand its behavior to ensure a safe experience for both the keeper and the tarantula.
Handling OBT safely
If handling becomes necessary, approach your OBT slowly and calmly. Avoid sudden movements or loud noises. Ideally, handle the tarantula over a soft surface, such as a bed or a large blanket, to minimize the risk of injury if it falls. Use a soft, wide brush to gently coax the tarantula onto your hand. Never grab the tarantula or try to force it to move. Be mindful of its urticating hairs, and avoid touching your face or eyes after handling. Always wash your hands thoroughly after contact. Remember, handling is stressful for the tarantula and should be kept to a minimum. Focus on creating a comfortable and secure environment within its enclosure to minimize the need for handling.
Creating the Ideal OBT Habitat

Creating the right habitat is vital for the well-being of your Bolivian Orange Bellied Tarantula. The enclosure should replicate the tarantula’s natural environment, providing it with security, comfort, and the essential elements it needs to thrive. The setup should be appropriate in terms of size, substrate, temperature, humidity, and enrichment. The proper habitat helps reduce stress and allows the tarantula to exhibit natural behaviors. Preparing your OBT’s home is one of the first and most important steps.
Choosing the Right Enclosure
The enclosure should be appropriately sized for your OBT. A good rule of thumb is to provide an enclosure that is at least three times the tarantula’s leg span in width and length. This allows it to move around and explore comfortably. The height of the enclosure should be sufficient to prevent escapes. A secure lid is a must to prevent accidental escapes. Glass or acrylic enclosures are the most common choices because they are easy to clean and allow for good visibility. Ensure the enclosure has adequate ventilation to prevent the buildup of humidity, which can lead to health problems. Consider adding a front-opening door to make maintenance easier. The choice of enclosure will depend on your space and your needs.
Substrate and Decorations
The substrate is the bottom layer of your OBT’s enclosure and serves several purposes. It provides a place for the tarantula to burrow, helps maintain humidity, and acts as a natural surface. A good substrate for an OBT includes a mixture of peat moss, coco fiber, and a small amount of vermiculite. This mix holds moisture well and allows for burrowing. The substrate depth should be at least 4-6 inches to allow for burrowing. Decorations are also vital for providing enrichment. Include a hide, such as a half-log or a piece of cork bark, for the tarantula to retreat to and feel secure. You can also add artificial plants, branches, or other safe decorations to create a more natural environment. Avoid sharp objects that could injure the tarantula. Creating a natural-looking environment is key to keeping your OBT healthy and happy.
Temperature and Humidity

Maintaining the correct temperature and humidity levels is crucial for your OBT’s health. OBTs thrive in temperatures between 75-80°F (24-27°C). You can use a heat lamp or a heat mat placed on the side of the enclosure to achieve this temperature. Always monitor the temperature with a thermometer. The humidity level should be kept around 60-70%. You can measure humidity using a hygrometer. Mist the enclosure with dechlorinated water a few times a week, or add a water dish to help maintain the humidity level. Avoid extreme fluctuations in temperature or humidity, as these can stress the tarantula and lead to health problems. Keeping the environment stable is key.
Feeding Your Bolivian Orange Bellied Tarantula
Proper feeding is essential for the health and growth of your OBT. Providing the right food and maintaining a regular feeding schedule ensures the tarantula gets the necessary nutrients to thrive. Understanding the dietary needs of your OBT involves knowing what types of food are suitable, how often to feed them, and how to ensure they stay hydrated. A well-fed tarantula is a healthy tarantula, and learning about their eating habits is an important part of providing good care.
Appropriate food
OBTs are insectivores, so their diet should primarily consist of insects. Suitable food items include crickets, mealworms, dubia roaches, and other commercially available feeder insects. The size of the food should be appropriate for the tarantula’s size. Generally, prey items should be no larger than the tarantula’s body. It is important to gut-load the feeder insects before feeding them to your OBT. This involves feeding the insects a nutritious diet, such as vegetables and commercial insect food, to ensure they are packed with vitamins and minerals. Avoid feeding your tarantula wild-caught insects, as these can carry parasites or pesticides. Always prioritize the quality of the food you offer.
Feeding frequency

The frequency of feeding depends on the tarantula’s age and size. Spiderlings and juveniles should be fed more frequently, typically every 2-3 days. Adult OBTs can be fed less often, around once or twice a week. Always monitor the tarantula’s abdomen. If it appears plump and round, it’s well-fed. If the abdomen shrinks, it may be time for another feeding. Remove any uneaten food within 24 hours to prevent mold growth and maintain a clean enclosure. Adjust the feeding schedule as needed based on your observation of the tarantula’s behavior and body condition. Overfeeding can lead to health issues, so moderation is key.
Water and Hydration
Providing access to fresh water is crucial for your OBT’s hydration. A shallow water dish should always be available in the enclosure. Ensure the water dish is stable and easy for the tarantula to access. Use dechlorinated water or bottled spring water to avoid harmful chemicals found in tap water. Monitor the water level daily and refill as needed. Misting the enclosure regularly also helps to maintain humidity and provides an additional source of water. Some tarantulas may drink the droplets that form on the enclosure walls or decorations. Keeping fresh water available is an essential part of good care, helping to keep your OBT healthy.
Common Health Issues and Care
Like any pet, OBTs can be susceptible to certain health issues. Recognizing the signs of illness and knowing how to provide proper care can help ensure the health and longevity of your tarantula. Some common problems include issues during molting, parasites, and diseases. The ability to identify these problems early and take prompt action is critical to ensuring your OBT lives a long and healthy life.
Moulting process

Molting is a natural process where tarantulas shed their exoskeleton to grow. During this time, your OBT will typically become lethargic, stop eating, and may lie on its back. The molting process can take several hours or even days. It’s crucial to avoid disturbing your tarantula during molting. Provide a stable environment with appropriate temperature and humidity levels. After molting, the tarantula’s new exoskeleton will be soft and vulnerable. Wait for several days before offering food. Watch for any signs of difficulty molting, which may include the tarantula being stuck in its old exoskeleton. If this happens, consult an experienced tarantula keeper or a veterinarian familiar with exotic pets. Understanding the molting process is vital for any tarantula keeper.
Preventing Parasites and Diseases
Preventing parasites and diseases involves maintaining a clean and healthy environment. Regularly clean the enclosure and remove any uneaten food or waste. Use a suitable substrate and replace it periodically. Ensure proper ventilation to prevent the growth of mold or bacteria. Quarantine new tarantulas before introducing them to other specimens to prevent the spread of parasites or diseases. Gut-load feeder insects to prevent parasites. Watch for any unusual signs, such as lethargy, loss of appetite, or unusual behaviors. If you suspect your OBT is sick, consult with an experienced tarantula keeper or a veterinarian who specializes in exotic pets. Being proactive in maintaining a clean, healthy environment is the best way to prevent health issues.
OBT as Pets Considerations
Before acquiring an OBT, it’s essential to consider whether this species is the right pet for you. Tarantulas require specific care and a commitment to their well-being. Consider your lifestyle and how much time you can dedicate to providing proper care. Are you prepared to provide a suitable habitat, feed the tarantula regularly, and maintain the proper temperature and humidity levels? Researching the species extensively is also vital before bringing an OBT into your home. Learning about their specific needs, behavior, and potential health issues will help you provide the best possible care. Consider whether you are comfortable with the possibility of handling the tarantula and the potential for defensive behaviors. Ultimately, owning an OBT can be a rewarding experience if you are prepared to meet its needs.
In conclusion, the Bolivian Orange Bellied Tarantula is a fascinating species that, with proper care, can be a rewarding pet. By understanding their needs, providing a suitable habitat, and following a good care routine, you can ensure your OBT thrives. This guide provides a comprehensive introduction to keeping OBTs, and by following these guidelines, you’ll be well-equipped to care for these amazing creatures.
