What is the rationale behind providing additional cage volume for great apes weighing over 110 lbs?

The best rationale for providing additional cage volume for great apes weighing over 110 lbs is to allow for better exercise and psychological health. Great apes are highly intelligent and social creatures that require adequate space to move, engage in natural behaviors, and explore their environment. Sufficient cage volume promotes physical activity, which is vital for their overall health and well-being, preventing issues related to obesity and inactivity. Moreover, a spacious environment aids in reducing stress and promoting positive behavioral aspects, thereby supporting their psychological health.

While considerations like breeding conditions, handling ease, and preventing overcrowding are all aspects of animal care, the primary focus concerning great apes is their need for adequate space to promote both their physical and mental well-being. The emphasis on exercise and psychological enrichment underlines the importance of replicating conditions that allow these intelligent beings to thrive.