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One of the most intelligent birds, capable of associating words with meaning.
Recognizes itself in a mirror, a sign of advanced self-awareness.
Extinct in the wild for two decades, now being reintroduced in Brazil.
Its beak is powerful enough to tear through hides other scavengers can't.
A two-thousand-pound animal that can still sprint at 35 miles per hour.
Buries itself in sandy stream banks and waits months for the rains.
Senses warm-blooded prey in pitch dark using heat pits along its lips.
Swings through the canopy at up to 35 mph, leaping gaps of 50 feet.
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