What is one nutritional requirement vital for cavies?

High-fiber hay is a vital nutritional requirement for cavies, or guinea pigs, as it plays an essential role in their digestive health. Cavies are herbivores that require a diet rich in fiber to help maintain their gut function and prevent issues such as gastrointestinal stasis, a condition where the digestive system slows down or stops.

Hay, particularly timothy hay or other grass hays, is crucial because it provides the necessary roughage that keeps the digestive system moving and helps to wear down their continually growing teeth, preventing dental problems. A high-fiber diet also aids in the overall health and well-being of these animals by promoting a healthy weight and preventing obesity.

In contrast, while high-protein pellets, fruits and vegetables, and high-fat seeds can be part of a guinea pig's diet, they do not fulfill the essential fiber requirement necessary for maintaining optimal health. Over-reliance on pellets, fruits, and especially high-fat seeds can lead to imbalances in nutrition and should be given in moderation.