Birds are found across the known world in many shapes, forms and colours. They are distinguished from one another by plumage, size, beak shape, body length, wing size and talon type, as well as by dietary habits. Those that fall into a similar size range are provided for here and below; most are two or three feet long, weigh up to about three pounds and have a wing span of around four or five feet.

Eagles, hawks and falcons are birds of prey. Eagles can be considerably larger, sometimes exceeding even three feet in length and having a wingspan of anywhere from five to eight feet. The largest types may weigh up to twelve pounds.