Mexican Redknee Tarantula

Geographical Origin and Habitat: Native to the dry, coastal scrublands and deciduous forests of western Mexico, primarily in the states of Colima and Michoacán. They inhabit rocky terrain, excavating deep burrows at the base of rocks or cacti to escape the extreme heat of the day.

Taxonomy and Genetics: A member of the family Theraphosidae. It is a stocky, velvet-textured tarantula with a leg span of 15-16 cm. It features a jet-black carapace and legs decorated with bright orange-red bands on the joints (knees). They possess urticating hairs on their abdomen as a primary line of defense.

Behavior and Habits: Known for its docile, calm temperament, rarely biting unless under extreme provocation. When threatened, they prefer to kick urticating hairs from their abdomen with their hind legs. They are slow-moving and spend much of their time resting near their burrow entrance.

Morphology: Highly dimorphic in lifespan and mature structure. Females are much larger and heavier, living up to 30 years. Males are more slender with longer legs, develop tibial spurs and emboli on their pedipalps upon their final molt, and live only 4 to 5 years.

Terrarium Setup: Requires a terrestrial terrarium (minimum 40x30x30 cm). Height must be kept low, as a fall can cause their heavy abdomen to rupture, which is fatal. Provide a thick layer (10-15 cm) of dry organic soil or peat moss to allow burrowing, and a half-buried cork bark hide.

Lighting and Heating: Nocturnal and photophobic, avoiding direct light. Low ambient room lighting is sufficient. Maintain temperatures between 23 and 26°C. If heating is needed, attach a small heat mat to the side of the enclosure, never underneath, as burrowing tarantulas will overheat.

Humidity and Hydration: Adapted to dry climates, requiring moderate humidity (40-60%). The substrate should remain dry to prevent fatal respiratory mold infections. Provide a shallow water dish with fresh, clean water for drinking, and lightly mist the area around the dish every two weeks.

Feeding and Supplementation: Slow metabolism. Feed an adult tarantula one large cricket, roach, or mealworm every 10 to 14 days. If the abdomen is excessively large, suspend feeding for a few weeks. Tarantulas do not require any calcium or vitamin supplementation.

Compatibility: Strictly solitary. They must be housed individually. Keeping two tarantulas in the same enclosure will lead to cannibalism, especially when one is vulnerable during a molt. They are only paired briefly under supervision for breeding.

Health and Common Diseases: Molting (ecdisis) is a critical phase; the tarantula lies on its back and must not be touched or disturbed, which can cause fatal molt entrapment. Ruptured abdomens from falls are fatal. Stagnant humidity causes green mold on their book lungs.