Tarantulas and exotic spiders are increasingly popular companion animals, yet welfare standards are poorly understood even among experienced keepers. Getting the husbandry right is the foundation of tarantula welfare — most welfare failures stem from incorrect temperature, humidity, substrate depth, or feeding rather than active neglect.
The sentience of spiders is less well-established than for vertebrates, but growing evidence of pain responses, learning, and complex behaviour in invertebrates supports a precautionary welfare approach. Whether tarantulas experience subjective suffering is uncertain; nonetheless, providing appropriate environmental conditions remains an ethical responsibility.
Tarantula housing needs vary substantially by species:
Humidity requirements are species-specific: arid species (Mexican redknee) need low humidity; humid forest species (rose-hair tarantulas) need higher. Incorrect humidity causes respiratory distress and moulting problems.
Tarantulas moult periodically — shedding their exoskeleton to grow. Moulting is a vulnerable period: tarantulas should not be handled, fed, or disturbed during or immediately after moult. Providing appropriate substrate depth and humidity significantly reduces the risk of moulting complications (dysecdysis), which can be fatal. Live prey should be removed from the enclosure during pre-moult and post-moult phases.
Tarantulas are carnivores, feeding primarily on live or pre-killed invertebrates (crickets, mealworms, roaches). Live prey left in the enclosure when the tarantula is in pre-moult or post-moult can injure or kill the spider. Freshly moulted tarantulas are extremely vulnerable — do not attempt to feed for 1-2 weeks after moult. Overfeeding causes obesity and shortens lifespan in captive tarantulas.