Donkeys have evolved over thousands of years to live in semi-arid environments where the nutritional quality of the food available is very poor. They have adapted to eat fibrous plant material in small quantities throughout the day. This is known as trickle feeding and helps to keep the donkey’s digestive system healthy and to keep the donkey occupied.
Please note that, while donkeys are a member of the Equidae or horse family, they are a different species to horses and therefore have different needs.