Birds are warm-blooded like mammals but lay eggs like reptiles. They have feathers and wings which allow most to fly. There are over 9,000 bird species worldwide with diverse shapes, sizes, colors, and behaviors. Each year, 3,000 to 4,000 Bald Eagles gather along Alaska's Chilkat River to feed on salmon, helping the population recover from past threats. Adelie Penguins also return yearly to dense colonies, where parents take turns caring for eggs and young at pebble-ringed nests until the young can gather in groups.

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Birds are warm-blooded creatures, like mammals, but they lay eggs, like most reptiles. All birds have
feather and wings, and most birds are able to fly. Birds are amazingly varied in their shapes, sizes, color,
and behavior. There are more then 9,000 different species of birds in the world.
In mid-November 3,000 to 4,000 Bald Eagles gather along a 10-mile stretch of Alaska’s Chilkat River to
feed on spawning salmon. Once threatened with extinction in the lower 48 states, our national bird has
been making a slow comeback, thanks to conservation efforts.
Adelie Penguins gather in large dense colonies to breed. They return to the same place each year, where
they lay the eggs in a pebble-ringed nest on a rocky slope. Both parents take turns caring for the eggs and
the young. When the young penguins are little older they gather in a small group.