Hey!Berries treats are unique because of their shape and texture. Made from 70 percent hay, Hey!Berries also include tasty morsels of mango and papaya that add flavor, texture, energy and fiber. Each Hey!Berrie is formed into a small berry shape that encourages foraging behavior in rabbits, guinea pigs and other herbivores. The size makes them convenient for hand-feeding or for stashing them around for pets to find. The aroma of the hay and visible pieces of mango and papaya add to their appeal.