It is fine to feed apples to birds. Along with that birds also appreciate having other fruits such as plums, oranges, grapes, apples, crabapples, cherries, and prickly pear. It is found that birds may swallow small fruits whole. Thus, if you are feeding any fruits that contain seeds, it can cause harmful effects on the bird’s body. Hence, larger fruits may be shredded, sliced, pierced, or torn for birds to avoid any harmful effects.