Capybaras are the world's largest rodents and thrive in zoos when housed in social groups with access to water, diverse substrates, and varied enrichment opportunities.
Capybara welfare in zoos depends fundamentally on social housing and water access. These are animals that evolved in fluid, cohesive social groups and experience isolation or severely restricted groups as chronic stressors. Their apparently placid demeanor can mislead observers into thinking impoverished environments are acceptable; behaviorally trained observers can detect subtle stress responses that escape casual notice. Water access is not merely enrichment but a biological necessity for this semi-aquatic species. Grazing opportunities on appropriate grass and browse support dental health and allow expression of a behavioral repertoire that occupies much of the wild capybara day. Well-housed capybara groups are among the most behaviorally rich and visitor-engaging exhibits in contemporary zoos.