Enclosure and maintenance
Adults reach about 14–15 cm (5.5–6 in). Brachypelma hamorii is a terrestrial species, so the enclosure should prioritise usable floor space, a snug ground-level retreat and enough substrate to keep fall height low.
With Brachypelma hamorii, routine care should not involve handling. Arrange the water dish, retreat and door so feeding and cleaning can be done without repeatedly disturbing the spider.
Growth, feeding and moulting
Growth is slow. Feed to the spider's size, appetite and abdomen rather than forcing a rigid weekly schedule; the routine will change as Brachypelma hamorii grows.
If Brachypelma hamorii refuses food and shows premoult signs, remove live prey, keep water available and leave it alone. There is no need to make a spider in normal premoult eat.
Lifespan and buying one
Mexican Red Knee females often live 20–30 years; males often live around 6–10 years. For a female, that can be a decades-long commitment.
A sexed Mexican Red Knee label is only as useful as the evidence behind it. Ask how the sex was confirmed and get a measured size rather than relying on juvenile or sub-adult.