This keen eyesight allows them to see eight to 10 times better than people from a distance. Second, raptors must be strong enough to capture prey, but light enough to fly. Their bones are therefore filled mostly with air, making their bodies lighter for flight. They also have strong wings made up of many lightweight feathers. Third, all raptors have excellent hearing, especially the nocturnal birds.
Raptors use their hearing to listen for the calls of other birds.
The size of the talons determines the size of the prey they can carry. Accipters are small to medium sized hawks with short, rounded wings and a long tail. They often fly low when hunting. They circle high in the sky searching for rodents and other prey. The red-tail hawk is an example of a buteo.