Green and yellow anacondas are among the world's largest snakes. Meeting their complex aquatic, thermal, and space needs in zoo settings presents significant welfare challenges.
Anacondas in zoo settings face welfare challenges related to space, water access, thermal gradients, and opportunities for natural behaviour. These snakes require large aquatic enclosures with water deep enough for full submersion and areas for basking at appropriate temperatures. Inadequate conditions lead to stereotypic behaviour, immunosuppression, and chronic stress. Feeding enrichment using varied prey items and scent trails can help stimulate natural foraging responses. Social housing decisions must be made carefully, as anacondas are largely solitary except during breeding. Many zoos are re-evaluating whether they can meet the welfare needs of very large constrictors given the substantial resource requirements involved.