Slow lorises illustrate the limits of captive welfare when species biological needs are so incompatible with captive conditions that adequate welfare is essentially unachievable.
Slow lorises represent one of the clearest cases where the honest welfare assessment is that no captive environment can adequately meet the species needs. Their nocturnal ranging behavior, specialized foraging requirements, and three-dimensional habitat use are so incompatible with any practical captive setting that welfare deficits are predictable regardless of facility quality. The viral video phenomenon demonstrating apparent loris enjoyment of human contact caused enormous conservation and welfare harm by disguising the distress signals (raised arms) of a threatened animal exhibiting fear behavior. The welfare conclusion is that lorises should not be kept in captivity outside genuine conservation necessity, and the pet trade should be actively opposed as causing documented welfare harm.