Research conducted on zoo animals raises ethical questions about consent, welfare cost, and benefit to conservation or animal wellbeing.
Zoo animals cannot consent to research participation, placing the ethical burden entirely on researchers and institutions. Studies with clear welfare or conservation benefit and minimal intrusion are most easily justified. Blood sampling under anesthesia carries anesthetic risk. Behavioral studies using observation or voluntary cooperation via trained participation are preferable. Institutions with robust independent ethics oversight produce research that better balances scientific value against animal welfare cost.