Yes, cats can eat black beans in small amounts as an occasional treat. Black beans are a good source of protein, fiber, and other nutrients that can be beneficial for a cat's health. However, it's important to note that cats are obligate carnivores, which means that their diet should mainly consist of meat-based protein. Feeding too many black beans or other plant-based foods to cats can cause digestive upset, as cats are not able to digest plant-based proteins as efficiently as animal-based proteins. Therefore, it's best to give black beans to cats in small amounts as an occasional treat and not as a regular part of their diet. If you have any concerns or questions about your cat's diet, it's recommended to consult with your veterinarian for personalized advice.