Sea eagle

Sea eagles, also known as fish eagles, are specialized birds of prey. They belong to the subfamily Haliaeetinae. These birds are part of the larger Accipitridae family. They are famous for living near water. You can find them in coastal areas and riverine habitats throughout the world.

Because they rely on water, they are very important to their ecosystems. However, human impacts on the environment have created specific threats to their survival. International groups like CITES work to protect these species through trade regulations.

Scientists use DNA and physical traits to group these birds. For a long time, the genus Haliaeetus was used for many species. In 1809, the French naturalist Marie Jules César Savigny introduced this genus. Later, molecular studies in 2005 showed that Haliaeetus was paraphyletic. This means the group did not include all descendants of a common ancestor. Because of this, scientists moved some species into a different group called Icthyophaga. A 2024 study by Therese Catanach and her team found that Icthyophaga is distinct enough to be its own genus. This led researchers to move more tropical members of Haliaeetus into the expanded Icthyophaga genus.

Sea eagles vary significantly in their physical appearance and size. Most are brown, ranging from rich brown to dull grey-brown. Many species feature white feathers on their heads, tails, or underparts. Some adult birds possess an all-yellow beak. This is a rare trait among eagles.

The species often come in pairs with similar looks. For example, the white-tailed eagle and the bald eagle are a pair. One has a white head and the other has a tan head. Other pairs include the Sanford's and white-bellied sea eagles. The African and Madagascar fish eagles also form a pair.

Size is another way to tell these birds apart. The Steller's sea eagle is a massive bird. It can weigh up to 9 kg. The white-tailed eagle is the largest eagle in Europe. It can weigh up to 6.6 kg. In North America, the bald eagle is the largest native eagle. It can weigh up to 6.3 kg. The white-bellied sea eagle can weigh up to 4.5 kg.

These birds are powerful hunters. They primarily eat fish, aquatic birds, and small mammals. They build very large nests in trees or sometimes on cliffs.

Sea eagles have a very long evolutionary history. They may be one of the oldest living bird genera. Scientists found a fossilized bone in Egypt from the early Oligocene. This bone is about 33 million years old. It belongs to a bird from the Jebel Qatrani Formation. The bone pattern is very similar to modern sea eagles. The origin of these birds is likely near the Bay of Bengal. As the Indian subcontinent collided with Eurasia, the birds diverged. This likely led to the four tropical species found around the Indian Ocean today.

There are ten known extant species of sea eagles. Some belong to the genus Haliaeetus, such as the Bald eagle. The Bald eagle lives in much of Canada, Alaska, and the United States. The White-tailed eagle lives across Eurasia, from Greenland to Japan. The Pallas's fish eagle lives in parts of Asia, including China and India. Other species belong to the genus Icthyophaga. The African fish eagle lives in Sub-Saharan Africa. The White-bellied sea eagle lives from India to Australia.

These birds hold deep cultural significance around the world. The bald eagle is the national symbol of the United States. The white-tailed eagle is the national bird of Poland. In Africa, the African fish eagle is the national bird for Namibia, Zambia, and Zimbabwe. Even in sports, these birds are honored. The Manly Warringah Sea Eagles is a professional rugby league club in Australia.

While ospreys are sometimes called sea eagles in heraldry, they are actually in a different family called Pandionidae.