Mexican Orange-Kneed Tarantula
While terrifying to some, the Mexican orange-kneed tarantula, also called red-kneed tarantula, is a very popular pet. Despite their ominous size and fangs, these tarantulas are quite docile. They can throw hair or bite when threatened, but their venom isn’t normally harmful to humans.
Kingdom: Animalia
Phylum: Anthropoda
Class: Arachnida
Order: Araneae
Family: Theraphosidae
Genus: Brachypelma
Species: Brachypelma smithi
Common Name: Mexican Red-Kneed Tarantula, Orange-Kneed Tarantula
The Mexican orange-kneed tarantula is a solitary burrowing spider that spends the majority of its time in the two chambers (reached by tunnels) that comprise the burrow. They are found in the Pacific mountains of Mexico. Tarantulas are primarily insectivorous, but will occasionally prey on small vertebrates if an opportunity arises. Their venom is a cytotoxin that breaks down tissue to turn prey into a liquid form that the tarantula can digest. As ectotherms, tarantulas can go months without eating.
When threatened by predators, these tarantulas will “throw” barbed urticating hairs from their abdomen and legs. These hairs are irritating and get burrowed into the skin or eyes and can cause rashes and blindness.
Tarantulas are oviparous and will produce 200-400 eggs a few weeks after breeding. The eggs are deposited in an egg sac. The eggs hatch in about three months, but the spiderlings remain inside of the egg sac for an additional three weeks. The spiderlings usually leave the burrow about two weeks after emerging from the egg sac.
Breeding is the only time that the orange-kneed tarantula are social. During the rainy season, a male red-kneed tarantula will approach the burrow of a female in order for her to determine if he is desirable for mating. If the male is refused, he needs quickly escape or risk being eaten by the female.
A Mexican orange-kneed tarantula has a leg span of about 4 inches and a body that averages around 2 inches. The bodies of the males are slightly smaller than females, but males have longer legs. There are two claws at the end of each of their 8 legs. These tarantulas have pedipalps near their jaws to handle food. The body is comprised of a cephalothorax and abdomen. The body and legs are covered in bristly urticating hairs that are bluish-black. Their name derives from the reddish-orange bands around the upper middle portion of their legs.
Mexican orange-kneed tarantulas are docile and make popular pets. These arachnids are frequently exhibited in zoos, museums, and nature facilities. Due to their docile nature, these tarantulas are often used in movies and on television shows.
Due to habitat destruction and their popularity in the pet trade industry, Mexican orange-kneed tarantulas are listed as Near Threatened on the IUCN Red List.