Group 4 of nonhuman primate cage size requirements specifically includes which type of animal?

The correct choice identifies male macaques and large African species as part of Group 4 of nonhuman primate cage size requirements. This classification is rooted in the acknowledgment that these particular primates have specific behavioral and spatial needs due to their size and social structure.

Male macaques, for instance, are known for their larger physical dimensions and need for sufficient space to engage in natural behaviors, which influence their well-being. Large African primates, such as certain species of baboons or gorillas, similarly require more extensive living environments that accommodate their social interactions and physical activity. The regulations aim to ensure that these animals are housed in conditions that support their physical and psychological health.

In contrast, young tamarins, squirrel monkeys, and marmosets may fall under different categories with distinct space requirements. These smaller primates have different social and environmental needs, which are considered in the specific regulations designed for them. Thus, the choice of male macaques and large African species accurately reflects the criteria set forth in the animal welfare standards governing cage size and environmental enrichment.