River otters are highly active, playful mammals with strong requirements for aquatic access and complex environments to maintain good welfare in captivity.
Otter welfare in zoo settings requires substantial aquatic space for swimming and diving, land areas for play and resting, and complex environmental arrangements that engage their high activity levels and playful nature. Small water features that allow only swimming without diving, or facilities without adequate land space, prevent full behavioral expression. Otters are naturally curious and highly active — stereotypic pacing along the enclosure edge is a clear sign of inadequate space or stimulation. Foraging enrichment using live or frozen fish, puzzle feeders, and rotating novel objects maintains the behavioral complexity that wild otters experience through extensive movement across varied waterscapes. Social housing in family groups provides social stimulation that reduces individual stress.