Zoo invertebrate collections are growing as public interest in arthropods and other invertebrates increases. Welfare standards for these animals are emerging as science develops.
The welfare science for captive invertebrates is in early development. Temperature and humidity mismatches cause chronic physiological stress even without detectable behavioural indicators. Moulting periods are vulnerable and require specific conditions to prevent complications. Species held in inappropriate social groupings - some tarantulas are cannibalistic - face injury risk. As sentience science develops and if invertebrate capacity for suffering is confirmed, the standards applied to zoo collections will need updating rapidly. Precautionary provision of appropriate conditions is the responsible approach.