Invertebrate pets including tarantulas occupy a welfare gray zone where scientific uncertainty meets growing keeper responsibility.
Tarantula welfare sits at the boundary of welfare concern where scientific uncertainty is greatest. While we cannot confidently attribute rich subjective experience to tarantulas, their ability to respond to environmental conditions and show stress-related behaviors warrants attention to basic husbandry requirements. Species-appropriate housing with correct substrate, humidity, and temperature is both welfare-relevant and practically achievable. The conservation welfare dimension — wild capture for the pet trade — is clearer: it harms wild populations and introduces stress from capture and transport. Supporting the captive-bred tarantula hobby over wild-caught animals benefits both conservation and individual welfare.