. Adventures with animals and plants. Biology. PROBLEM I. The Kinds of Anmmls birds that wade or swim, perching birds, and birds that cannot fly. Birds of prey. These are the eagles, hawks, vultures, and owls. Their wings spread wide and firm; their talons (claws) are cruel, curved daggers which can be driven deep into the body of a small mammal or other bird; their strong beaks used for tearing flesh are hooked and sharp. Some hawks, eagles, and vultures are easily recognized in flight because of their remarkable ability to soar, that is, to remain aloft with almost no movement of the wings.