What are Tarantula Hornworms?
Tarantula hornworms, scientifically known as Manduca sexta larvae, are a popular food source for pet tarantulas. These caterpillars, also known as tobacco hornworms, are the larval stage of the hawk moth. They are prized by tarantula keepers for their high moisture content and nutritional value, which contributes to a well-hydrated and healthy spider. Hornworms are typically light green with a distinctive horn at their posterior end, hence the name. They are readily available at most pet stores specializing in reptile and invertebrate care, or can be ordered online. Their relatively soft bodies and ease of digestion make them an excellent choice for tarantulas of all sizes, including juveniles. Selecting the right food for your tarantula is the first step in keeping it healthy and happy.
Why Feed Tarantula Hornworms?
Feeding hornworms to your tarantula offers several significant advantages. The primary benefit is the excellent hydration they provide. Tarantulas, particularly those kept in drier environments, can easily become dehydrated, and hornworms help to combat this issue. In addition, hornworms have a relatively soft exoskeleton, which makes them easy for tarantulas to consume and digest. This is especially beneficial for younger or smaller tarantulas that may struggle with tougher prey. Hornworms also stimulate a tarantula’s natural hunting instincts. The movement of the worm can trigger the tarantula’s predatory behavior, providing enrichment and mental stimulation. Incorporating hornworms into your tarantula’s diet can contribute significantly to its overall well-being.
Nutritional Benefits of Hornworms

Hornworms are a nutritious food source, providing a good balance of essential nutrients for your tarantula. They are rich in water content, crucial for maintaining hydration, and contain a moderate amount of protein. However, it’s important to note that hornworms are relatively low in fat, which is beneficial in moderation, preventing obesity in your tarantula. They also contain essential vitamins and minerals, which support your tarantula’s overall health. While they are a good staple food, they shouldn’t be the only food offered. A varied diet with occasional crickets, dubia roaches, or other insects will provide a more balanced intake. Always research the nutritional value of any food item before introducing it to your tarantula’s diet to ensure it meets their specific needs.
When to Feed Your Tarantula Hornworms
The feeding schedule for your tarantula, including the use of hornworms, depends largely on its age and growth stage. Juvenile tarantulas, actively growing, will require more frequent feedings, often every other day or every three days. Subadults and adults can be fed less often, perhaps once or twice a week, depending on the size of the tarantula and the hornworms. It’s crucial to observe your tarantula’s behavior. If it consistently refuses food, it might be molting, or the humidity/temperature in the enclosure might need adjustment. Do not feed a tarantula that appears to be in premolt (signaling the start of the molting process). Providing hornworms at the right time ensures your tarantula receives the necessary nutrients without overfeeding or stressing it.
How Often to Feed Tarantula Hornworms
Determining the frequency of hornworm feedings involves considering several factors, including the size and age of the tarantula, and its overall health. As a general guideline, young tarantulas (spiderlings) that are growing quickly can be fed a small hornworm every other day, or every three days. As the tarantula matures, the feeding frequency decreases. Adult tarantulas often thrive on one or two hornworms a week. Overfeeding can lead to obesity, which may cause health issues and reduce the lifespan of your pet. Always monitor your tarantula’s abdomen, which should not become excessively large or round. Adjust the feeding schedule based on these observations. It’s always better to slightly underfeed than to overfeed, so err on the side of caution, and provide a water dish for hydration.
What Size Hornworms to Feed

Choosing the correct size hornworms is a critical aspect of successful tarantula feeding. The general rule is to provide a hornworm that is no larger than the tarantula’s body length. This ensures the tarantula can effectively subdue and consume its prey. For smaller tarantulas, provide smaller hornworms, and adjust the size as your tarantula grows. Never feed a hornworm that is significantly larger than the tarantula’s body, as this can overwhelm the spider and potentially cause injury. Monitor your tarantula’s ability to eat the hornworm. If it struggles, the hornworm may be too large. Ensure the hornworms are appropriate for your tarantula’s size to promote safe and efficient feeding.
Preparing Hornworms for Feeding
Proper preparation of hornworms can enhance the feeding process and ensure your tarantula receives the maximum benefit. Before feeding, lightly dust the hornworms with a calcium and vitamin supplement. This helps provide essential nutrients. If you purchased hornworms from a pet store, examine them before feeding. Remove any dead or dying worms, as these can carry disease. To make the feeding process easier, you may need to place the hornworm directly in front of the tarantula, using tongs to ensure it is within reach. Be patient and allow the tarantula to initiate the hunt. Careful preparation is important to providing a safe and enriching meal.
The Feeding Process Step-by-Step
The actual feeding of hornworms to your tarantula involves a few straightforward steps. First, prepare the hornworms as mentioned above. Next, using tongs, gently offer the hornworm to your tarantula. Many tarantulas will quickly seize the prey. Some tarantulas might be more hesitant, in which case, leave the hornworm in the enclosure and observe the tarantula’s reaction. If the tarantula doesn’t eat within a few hours, remove the hornworm, especially if it’s a juvenile, as the hornworm could potentially harm the tarantula. If the tarantula eats the hornworm, allow it to consume the prey undisturbed. Avoid handling the tarantula during the feeding process to minimize stress. Clean up any leftover parts of the hornworm after the tarantula is finished, to avoid any health risks within the enclosure.
Observe Your Tarantula’s Eating Habits

Closely observing your tarantula’s eating habits is crucial for their health. Note the tarantula’s appetite, how quickly it consumes the hornworm, and the overall behavior before, during, and after feeding. A healthy tarantula will typically be eager to hunt and eat, especially if it’s hungry. A lack of appetite can be a sign of several issues, such as a pending molt, stress, or underlying illness. Monitor the tarantula’s abdomen size as well. If it appears too plump, it may be an indicator of overfeeding. If your tarantula refuses to eat, evaluate environmental factors, the tarantula’s health, and adjust the feeding schedule accordingly. Understanding your tarantula’s eating patterns helps to keep them healthy.
Dealing with Leftover Hornworms
It’s not unusual for tarantulas to leave parts of the hornworm uneaten, particularly if the prey is too large. If a portion of the hornworm remains after a feeding, remove it promptly. Leftover hornworms can decompose in the enclosure, attracting mites or causing other health concerns. Dispose of any uneaten portions safely. It’s also possible to gut-load hornworms with nutrients before feeding them to your tarantula. You can feed hornworms with nutritious foods. This will in turn benefit your tarantula. When you acquire hornworms, you can also keep a few for the next feeding, if you wish. Keeping your tarantula’s habitat clean is critical to its well-being, and removing leftover prey is an important component of that.
Troubleshooting Feeding Issues
Encountering feeding problems with your tarantula is not uncommon. If your tarantula refuses to eat, first check if it’s in premolt. A tarantula that is preparing to molt will often stop eating. Ensure environmental factors, such as temperature and humidity, are within the correct range for your tarantula’s species. Stress can also cause a loss of appetite; this could be related to improper handling or changes in the environment. If the tarantula refuses to eat for an extended period, consult a veterinarian specializing in exotic animals. Persistent refusal to eat can signify an underlying health issue. You may also need to adjust the prey size. Correcting these problems as quickly as possible keeps your tarantula healthy.
Other Considerations and Care Tips

Beyond the basics of feeding, several other factors are crucial for tarantula care. Maintain appropriate temperature and humidity levels for your species; research your tarantula’s specific needs. Provide a suitable substrate, such as coconut fiber, and ensure the enclosure is secure. Offer a clean water source. Avoid handling your tarantula unless necessary, as they can be easily stressed. Regularly clean the enclosure to prevent the buildup of waste and potential diseases. Always handle your tarantula with care. Educate yourself about the specific care requirements of your tarantula species. These combined practices will ensure your tarantula thrives.
