Eagle

Accipitridae (multiple genera, esp. Aquila, Haliaeetus, etc.)

Eagles are large birds of prey found on every continent except Antarctica, from the golden eagle of open mountain country to the harpy eagle of South American rainforest canopies. Their eyesight resolves detail several times finer than a human's, letting a soaring bird pick out a rabbit from more than a kilometre away. Some species are in serious trouble: the Philippine eagle is Critically Endangered with only a few hundred pairs left.

Quick facts: Size 0.5 to 1.1 m body length; wingspans from 1.6 to 2.5 m · Lifespan Typically 15-25 years, up to 40 in wild or captivity · IUCN status Varies by species; most are Least Concern, but several are Endangered or Critically Endangered

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Eagles at a glance

Need to know

• Eagles possess the largest nests of any bird, some exceeding 2 meters in diameter.
• The Harpy Eagle is one of the world’s most powerful birds of prey, able to hunt monkeys and sloths.
• Some eagles can spot prey from more than 3 kilometers (2 miles) away thanks to their incredible eyesight.
• Female eagles are typically larger than males, a trait known as sexual dimorphism.
• The fastest dives of eagles can reach up to 160 km/h (100 mph).
• Eagle populations are especially vulnerable to environmental toxins like DDT, which caused drastic declines in the 20th century.

About the Eagles

Eagles are large, powerful birds of prey belonging primarily to the family Accipitridae. Recognized for their impressively broad wings, sharp talons, and keen eyesight, eagles occupy the top of the food chain in many terrestrial and near-water ecosystems worldwide. Their presence in myth and symbolism spans ancient civilizations, representing power, freedom, and vision.

Most eagle species are apex predators, specializing in everything from fish to monkeys, and can exhibit diverse foraging and nesting behaviors depending on their ecological niche. Eagles are of exceptional conservation interest, with some species thriving while others face significant threats from habitat loss and human encroachment.

Physical characteristics

Size: 0.5 to 1.1 m body length; wingspans from 1.6 to 2.5 m. Weight: 2 to 7 kg (range across species). Lifespan: Typically 15-25 years, up to 40 in wild or captivity.

• Large, hooked beak
• Strong, powerful talons
• Keen, forward-facing vision
• Broad wings with large surface area
• Sexual dimorphism (females larger than males)

Notable species

• Bald Eagle (Haliaeetus leucocephalus) — Least Concern. Large lakes, rivers, and coastal habitats Regions: North America, Alaska, Canada, United States, northern Mexico.
• Golden Eagle (Aquila chrysaetos) — Least Concern. Mountains, cliffs, open country Regions: Europe, Asia, North America, North Africa, Middle East.
• Harpy Eagle (Harpia harpyja) — Near Threatened. Tropical lowland rainforests Regions: Amazon Rainforest, Central America, northern South America, Atlantic Forest of Brazil.
• Steller's Sea Eagle (Haliaeetus pelagicus) — Vulnerable. Coastal cliffs, river mouths, and estuaries Regions: coastal Russian Far East, Sea of Okhotsk, Bering Sea, coastal Japan.
• African Fish Eagle (Haliaeetus vocifer) — Least Concern. Large lakes, rivers, and wetlands Regions: Sub-Saharan Africa, Great Rift Valley lakes, Lake Victoria, Zambezi River, Okavango Delta.
• Philippine Eagle (Pithecophaga jefferyi) — Critically Endangered. Dense tropical forests in steep mountains Regions: Luzon, Mindanao, Leyte, Samar.

Habitat and range

Original range: Evolved in Eurasia during the early Miocene; radiated into every continent except Antarctica.

Current distribution: Nearly all continents except Antarctica, adapted to a range of habitats from arctic tundra to tropical rainforests and desert canyons.

Preferred environments: Forest and woodland, Mountains and cliffs, Large lakes and rivers, Wetlands and estuaries, Open plains and grassy savannahs

Regions: North America, South America, Europe, Asia, Africa, Australia, Amazon Rainforest, Great Rift Valley lakes, Sea of Okhotsk, coastal Japan, Atlantic Forest of Brazil, Middle East

Where to see Eagles

• Yellowstone National Park (USA) — Spring and Summer. Spot Bald Eagles near lakes and rivers during fishing and nesting season.
• Scottish Highlands (UK) — Year-round. Look for Golden Eagles soaring over open moorlands and rocky ridges.
• Amazon Rainforest (Brazil/Peru) — June to October (dry season). Guided rainforest tours may help you find the elusive Harpy Eagle.
• Lake Victoria (Africa) — June to September. African Fish Eagles are commonly seen hunting in the region.
• Shiretoko Peninsula (Hokkaido, Japan) — January to March. Visit during the winter to observe Steller’s Sea Eagles fishing on ice flows.

Behavior and diet

Diet: Varies by species; includes fish, mammals, birds, reptiles, and carrion. Sea eagles specialize in fish, while others like the Harpy Eagle hunt large mammals.

Social structure: Primarily solitary or found in breeding pairs; occasional loose associations around rich food sources.

Communication: A variety of vocalizations (calls, screams), visual displays, and territorial flights.

• Spectacular courtship flights and talon-locking aerial displays
• Reuse and enlargement of nesting sites over decades
• Soaring at great heights for hours while searching for prey
• Strong territoriality, especially during breeding season

Interactions with other animals

• Fish (predator): Many eagle species, especially sea eagles, rely heavily on fish as their principal diet.
• Monkeys (predator): Harpy Eagles hunt medium-sized monkeys and sloths in tropical forests.
• Other raptors (hawks, vultures) (competitive): Eagles may compete with other birds of prey for territory and food resources.
• Humans (competitive): Eagles are affected by habitat disturbance and, historically, hunting and poisoning by humans.

Conservation

IUCN Red List status: Varies by species; most are Least Concern, but several are Endangered or Critically Endangered

Threats

• Habitat destruction (deforestation, urbanization)
• Poisoning from pesticides (e.g., DDT residues and other toxins)
• Persecution and hunting
• Electrocution on powerlines
• Climate change affecting habitat and prey availability

Conservation efforts

• Legal protection (e.g., Bald and Golden Eagle Protection Act in USA)
• Nest monitoring and habitat restoration programs
• Reduction and banning of harmful pesticides
• Public education and awareness campaigns
• Captive breeding and reintroduction efforts

How to help

• Support organizations that protect raptors and wild habitats
• Participate in or promote citizen science projects monitoring local eagle populations
• Reduce use of pesticides and chemicals outdoors
• Advocate for the protection of large wild areas and nesting sites
• Spread awareness about the ecological importance of eagles

Eagles facts for kids

Eagles are huge birds known for their powerful wings and super-sharp vision. They build massive nests and soar high in the sky searching for food, such as fish, rabbits, or even monkeys. Some eagles are common, while others are very rare and need our help to survive.

• Eagles can see four to five times farther than humans.
• The Bald Eagle is the national bird of the United States.
• Some eagle nests are so big that a grown-up person could curl up and sleep inside!
• A grown eagle can carry animals heavier than itself using its talons.
• Not all eagles are bald—Bald Eagles just have a white head.

Did you know? Did you know? The Harpy Eagle’s feet are as big as a human hand, and its talons can be longer than a grizzly bear’s claws!

Watch & learn

• The Ultimate Hunters: Eagle Power and Precision — BBC Earth. This BBC Earth feature explores the intelligence, hunting prowess, and majestic aerial skills of several eagle species, including the harpy and golden eagle, filmed in stunning HD across different continents.
• Harpy Eagle: The Jungle's Silent Predator — Smithsonian Channel. Follow the captivating story of one of the most powerful raptors, the harpy eagle, as Smithsonian Channel delves into its elusive behavior and place at the top of the rainforest food chain.
• Eagles vs. Snakes: Battle in the Sky — Nat Geo WILD. An action-packed documentary segment from Nat Geo WILD that showcases the specialized adaptations and strategies eagles use to hunt dangerous prey like snakes.
• Bald Eagles: America’s Fish Hawk — PBS Nature. This PBS Nature episode reveals the intricate lives of America's national bird, the bald eagle, focusing on their nest building, parenting, and staff-filmed real-life hunts.
• Golden Eagles in the Highlands: Masters of the Scottish Skies — BBC Earth. Travel to the wild Scottish Highlands with BBC camerapeople for unprecedented views of golden eagles hunting, soaring, and rearing their young in a challenging landscape.