Accipitridae

Accipitridae is a family of birds of prey. You may know them as hawks, eagles, kites, harriers, and Old World vultures. These birds have strong, hooked bills and come in many shapes, depending on what they eat. You can find them nearly everywhere, on every continent except Antarctica, and some even live on islands in the ocean. Many of these birds travel far during migration.

They eat many things, like insects and small mammals. Some also eat dead animals or fruit. There are 256 species in this family. They are grouped into 12 subfamilies and 75 genera. The osprey and the secretary bird are often considered separate from this group, as are the New World vultures. Studies show that accipitrids are a special and closely related group of birds.

Systematics and phylogeny

The Accipitridae family includes hawks, eagles, kites, harriers, and Old World vultures. There are 255 species in this family, split into 12 subfamilies and 75 genera. These birds come in many sizes and shapes, depending on what they eat, which can be anything from insects to mammals.

Our understanding of how these birds are related has changed with new research. Scientists study both their physical features and DNA. Some groups, like hawks and eagles, might not have shared a direct common ancestor as we once believed. This family has a long fossil history, going back about 50 million years, with many ancient species found around the world.

Morphology

The Accipitridae family includes birds of many different sizes and shapes. The smallest, like the pearl kite and little sparrowhawk, are about 23 cm long and weigh about 85 g. The largest, such as the cinereous vulture, can be up to 120 cm long and weigh up to 14 kg. Their wingspans range from 39 cm to over 300 cm.

These birds have strong, hooked beaks that help them catch food. Their plumage is usually white, grey, buff, brown, or black, often lighter on the belly to stay hidden. Many have very good vision for hunting, and some can see twice as clearly as humans.

Diet and behavior

Accipitrids are predators that hunt for food. They catch their prey with strong talons and use their hooked bills to tear it apart to eat or feed their young. Many will eat almost any prey they can catch, but most have favorite foods. For example, harriers often hunt small animals like rodents.

Some accipitrids specialize in certain foods. Accipiter hawks mainly eat birds. Others, like the snail kite, mostly eat snails. Eagles often hunt larger animals, such as deer or birds, while fish eagles and ospreys catch fish. Many accipitrids also sometimes eat insects, carrion, or fruit, depending on what’s available.

Reproductive biology and populations

Accipitrids, like many birds that hunt other animals, have some interesting behaviors. Females are often larger than males, and pairs stay very loyal to each other and their nesting spots. They defend their territories by flying over them or using calls.

These birds build their own nests in safe places like tall trees or cliffs. Some nests can become very large from years of use. Most lay two to six eggs. The first hatchling often grows faster than its siblings. The smaller males usually bring food for the female and the babies, though sometimes they help sit on the eggs too. After leaving home, young birds may wander for several years before they are ready to find their own mates.