In the wild, an animals physical environment constantly provides stimulation. Captive environments should aim to do the same through careful planning and design, mimicking natural habitats as closely as possible. It is important to understand how a species may interact with the physical environment and provide a habitat that allows them to express these natural behaviours. Changing parts of the habitat regularly can also encourage exploration and investigation and provide additional stimulation.
Focus on encouraging hunting and feeding behaviours. Think about where they would find their prey, how they would stalk, chase and catch their prey and any species-specific hunting behaviours or adaptations. Food items including fur and feathers will encourage natural feeding (and sometimes play) behaviours and increases the time taken to consume food.