Study the migratory, predatory, and living habits of North American bald eagles
Bald eagles (Haliaeetus leucocephalus) flying, perching, and fishing in the Chilkat River valley of southern Alaska.
Encyclopædia Britannica, Inc.
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Contunico © ZDF Studios GmbH, Mainz; Thumbnail © Rinus Baak/Dreamstime.comLearn about the monarch butterfly, including its annual migration to Mexico.
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Encyclopædia Britannica, Inc.Learn about the transmission of P waves (primary waves), which alternately squeeze and stretch the transmitting medium, causing it to move back and forth in the direction of propagation.
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Created and produced by QA International. © QA International, 2010. All rights reserved. www.qa-international.comThe big-bang theory proposes that the universe expanded from a highly compressed state.
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Encyclopædia Britannica, Inc.The B-29 Superfortress Enola Gay took off from the Mariana Islands on August 6, 1945, bound for Hiroshima, Japan, where, by dropping an atomic bomb, it heralded a new and terrible concept of warfare. From The Second World War: Allied Victory (1963), a documentary by Encyclopædia Britannica Educational Corporation.
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Encyclopædia Britannica, Inc.Cheetahs (Acinonyx jubatus) among a herd of gazelles. Stalking them slowly at first, the cheetahs break into a sprint, pursuing and capturing one of the gazelles. The spotted hyena is an ever-present and dangerous interloper.
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Public Domain videoWilliam Jennings Bryan's “Cross of Gold” speech, given at the Democratic National Convention, Chicago, July 8, 1896.
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Encyclopædia Britannica, Inc.Starfish preying upon a mussel.
News •
Bald eagle mistaken for trashbag on the road to recovery
• Nov. 2, 2026, 9:00 AM ET (Popular Science)
Transcript
NARRATOR: The eagle, a bird that embodies both power and grace, has been the chosen symbol of many civilizations, representing loyalty, strength, and courage. In 1782 the bald eagle was adopted as the national symbol of the United States.
Native to North America, the bald eagle ranges from northern Canada to northern Mexico. It is usually found in the vicinity of water, along rivers, lakes, marshes, and seacoasts. Its scientific name, Haliaeetus leucocephalus, means “white-headed sea eagle,” but the distinctive white head and tail feathers appear only after the bird has reached four or five years of age. Fully grown eagles can weigh up to seven kilograms and have a wingspan of up to two and a half meters.
The bald eagle is a great hunter. Its diet consists primarily of fish, but it will also feed on ducks, rodents, snakes, and carrion. Its keen eyes can spot prey a mile away. With its strong sharp talons, the bald eagle is capable of carrying up to five kilograms while in flight.
Today, the greatest number of bald eagles can be found in Alaska. There are about 40,000 eagles throughout the state. Every year, from October to January, thousands of bald eagles migrate here to Chilkat Valley in southern Alaska. And every year thousands of salmon swim up the Chilkat River to spawn and then slowly die. The weak fish are an easy target for the eagles, which feast on the annual salmon die-off.
Listed as an endangered species in 43 of the lower 48 states until 1995, the bald eagle is making a remarkable comeback. Through the recovery efforts of the United States Fish and Wildlife Service, the banning of DDT, and the general improvement of their habitat, bald eagle populations have steadily increased. While in the early 1960s fewer than 450 nesting pairs were estimated in the 48 coterminous United States, there are now nearly 4,500 adult bald eagle nesting pairs and many more young.
Native to North America, the bald eagle ranges from northern Canada to northern Mexico. It is usually found in the vicinity of water, along rivers, lakes, marshes, and seacoasts. Its scientific name, Haliaeetus leucocephalus, means “white-headed sea eagle,” but the distinctive white head and tail feathers appear only after the bird has reached four or five years of age. Fully grown eagles can weigh up to seven kilograms and have a wingspan of up to two and a half meters.
The bald eagle is a great hunter. Its diet consists primarily of fish, but it will also feed on ducks, rodents, snakes, and carrion. Its keen eyes can spot prey a mile away. With its strong sharp talons, the bald eagle is capable of carrying up to five kilograms while in flight.
Today, the greatest number of bald eagles can be found in Alaska. There are about 40,000 eagles throughout the state. Every year, from October to January, thousands of bald eagles migrate here to Chilkat Valley in southern Alaska. And every year thousands of salmon swim up the Chilkat River to spawn and then slowly die. The weak fish are an easy target for the eagles, which feast on the annual salmon die-off.
Listed as an endangered species in 43 of the lower 48 states until 1995, the bald eagle is making a remarkable comeback. Through the recovery efforts of the United States Fish and Wildlife Service, the banning of DDT, and the general improvement of their habitat, bald eagle populations have steadily increased. While in the early 1960s fewer than 450 nesting pairs were estimated in the 48 coterminous United States, there are now nearly 4,500 adult bald eagle nesting pairs and many more young.
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