Penguins are popular aquarium attractions whose welfare needs — extensive swimming space, cold temperatures, and social groups — are challenging to meet in captivity.
Penguin welfare in captivity involves fundamental compromises: the swimming distances, temperature environments, and food-seeking behaviours that constitute their natural lives cannot be replicated in aquariums. Social groups can be maintained with good management, but swimming range cannot. Aquariums housing penguins must invest heavily in appropriate environmental complexity, temperature control, veterinary care, and social management to approach reasonable welfare. Species choice matters — smaller species adapted to milder climates can be kept to higher welfare standards than large cold-water species.