Polar bears are among the most challenging species to maintain in zoological settings, given the extreme mismatch between their natural Arctic habitat and temperate zoo environments.
Polar bear welfare in captivity presents fundamental challenges that even the best-designed exhibits cannot fully resolve. The spatial disparity between natural range and exhibit size is orders of magnitude — even very large zoo exhibits cannot provide the locomotory and cognitive stimulation of a wild polar bear's existence. The result is stereotypic pacing behaviour that is extremely difficult to eliminate and reflects chronic frustration and boredom. Some facilities have achieved meaningful welfare improvements through: complex naturalistic enclosures with pools deep enough for swimming; highly varied enrichment programmes that change daily to prevent habituation; training regimes that create cognitive challenge; and careful management of social groupings. The ethical question of whether polar bears should be maintained in temperate zoo collections at all has prompted some institutions to transfer their animals to facilities better suited to the species or to phase out polar bear keeping. Where zoos retain polar bears, demonstrating measurable welfare improvement through welfare monitoring — and being transparent about stereotypy prevalence — is the minimum standard of honesty.