Colombian Lesserblack Tarantula: Health, Temperament, Care & Costs

The Colombian Lesserblack tarantula is a New World pet tarantula kept for its calm, watchable nature and manageable care needs. In the hobby, common names and scientific names are not always used consistently, so pet parents may see this spider listed under different trade names. In general, these tarantulas are terrestrial spiders that do best in a secure, low-height enclosure with room to hide and burrow rather than climb.

Most individuals are shy more than social. They are usually display pets, not handling pets. Even calm tarantulas can bite if stressed, and New World species may also kick irritating urticating hairs. That means gentle, minimal handling is safest for both the spider and the pet parent.

Adult females often live much longer than males. For many medium terrestrial tarantulas, females may live well over a decade, while males often have much shorter adult lives after maturing. Adult leg span is commonly around 4 to 6 inches, with a stocky body and slow, deliberate movement.

For day-to-day care, success usually comes down to steady husbandry: appropriate substrate depth, a hide, access to shallow water, feeder insects of the right size, and humidity that supports normal hydration and molting. When those basics are off, health problems are much more likely.

Tarantulas do not get the same routine medical problems seen in dogs and cats, but they are very sensitive to husbandry mistakes. The biggest concerns are dehydration, poor humidity control, traumatic injury from falls, and molting complications. A tarantula that is weak, unable to right itself, dragging legs, or stuck in a molt needs urgent guidance from your vet.

Molting problems are one of the most serious risks. Before a normal molt, many tarantulas slow down, web more, look dull, and may refuse food for days to weeks. During the molt they may lie on their back, which is normal. The concern starts when the molt is prolonged, incomplete, or followed by weakness, bleeding, or failure to recover. Live feeder insects left in the enclosure can injure a vulnerable spider during this period.

External parasites are less common in well-kept captive-bred spiders, but mites and other pests can still appear, especially with poor sanitation or contaminated feeder setups. Wild-caught invertebrates generally carry more risk than captive-bred animals. Trauma is also common: even a short fall can rupture the abdomen or injure legs, which is why tall enclosures and frequent handling are poor fits for most tarantulas.

See your vet immediately if your tarantula has a collapsed-looking abdomen, fluid leakage, severe weakness, inability to stand, obvious injury after a fall, or a molt that appears stuck or lasts longer than expected. Because invertebrate medicine is specialized, it helps to identify an exotics practice before there is an emergency.

A Colombian Lesserblack tarantula is often less costly to maintain than many reptiles or small mammals, but setup quality still matters. In the US in 2025-2026, the spider itself commonly ranges from about $40 to $150 depending on age, sex, and seller. Adult females usually cost more because they live longer. A secure terrestrial enclosure, hide, substrate, water dish, hygrometer, and basic tools often add another $80 to $200 for a thoughtful initial setup.

Monthly care is usually modest. Many pet parents spend about $5 to $20 per month on feeder insects, replacement substrate, and small husbandry supplies. Costs rise if you buy feeders in small quantities, replace décor often, or need climate-control equipment for a cool or very dry home.

Veterinary costs are the wildcard. Exotics practices in the US currently list wellness or medical exams around $86 to $100 at some dedicated exotic hospitals, with urgent or emergency visits commonly around $150 to $183 before diagnostics or treatment. If your tarantula needs supportive care, microscopy, hospitalization, or wound management, the total cost range can climb quickly.

A practical budget is an initial setup fund of $120 to $350, a recurring monthly cost range of $5 to $20, and an emergency reserve of at least $150 to $300. That gives you room to respond if your spider has a bad molt, injury, or sudden decline.

Colombian Lesserblack tarantulas are insectivores. In captivity, most do well on appropriately sized crickets, roaches, mealworms, or occasional waxworms. A good rule is to offer prey no larger than the tarantula's abdomen. Feeder insects should be healthy and, when possible, gut-loaded before use.

Adults often eat 1 to 2 times weekly, while younger spiders may eat more often because they are growing faster. Appetite naturally changes around molts. A tarantula that is preparing to molt may refuse food for days or even weeks, and that can be normal. During that time, avoid pushing food and remove uneaten prey promptly.

Fresh water matters even for species that do not seem to drink often. Use a shallow water dish and refresh it regularly. Deep bowls are not appropriate for small spiders. Mildly moist substrate in part of the enclosure may help support hydration, but the enclosure should not be kept soggy.

Do not feed wild-caught insects from areas that may have pesticides or parasites. If your tarantula stops eating for an unusually long time outside of a molt, loses body condition, or seems weak, your vet can help determine whether the issue is husbandry, dehydration, or illness.

Tarantulas do not need exercise sessions the way mammals do. Their activity is usually low to moderate and often centered around nighttime exploration, webbing, digging, and repositioning within the enclosure. For this species type, the goal is not more activity. It is safe, species-appropriate activity.

A low, secure enclosure with enough floor space, a hide, and several inches of suitable substrate supports normal movement and burrowing behavior. Terrestrial tarantulas should not be encouraged to climb. Falls are a major injury risk because the abdomen can rupture even from relatively short distances.

Handling is not enrichment for most tarantulas. Many tolerate brief transfers, but repeated handling increases stress and injury risk. Better enrichment includes changing the layout occasionally, maintaining a proper hide, and offering a calm environment with minimal vibration.

If your tarantula suddenly becomes very restless, repeatedly climbs the walls, stays pressed against the lid, or stops using its hide, review temperature, humidity, substrate condition, and enclosure security. Those behavior changes often point to a husbandry problem rather than a need for more activity.

Preventive care for a tarantula starts with husbandry. Choose a secure terrestrial enclosure that is wider than it is tall, provide a hide, keep clean substrate deep enough for burrowing, and monitor temperature and humidity with reliable tools. Stable conditions help prevent dehydration, stress, and difficult molts.

Daily observation is one of the best health tools a pet parent has. Check posture, movement, abdomen size, appetite pattern, water access, and the condition of the enclosure. Remove uneaten prey, especially if your tarantula is nearing a molt. Spot-clean waste and replace substrate on a regular schedule based on enclosure condition.

Plan ahead for veterinary care even if your spider seems healthy. Not every clinic sees invertebrates, so it is smart to locate an exotics practice before you need one. A baseline wellness visit can be helpful for new pet parents who want husbandry reviewed, especially if the tarantula is newly acquired, wild-caught, or showing inconsistent feeding or molting behavior.

Quarantine new invertebrates and feeder colonies when possible. That lowers the risk of introducing mites or other pests. If you notice sudden weakness, injury, abnormal fluid loss, or a problematic molt, contact your vet promptly. Early supportive care can matter.