Like humans and other mammals, Chickens go through a REM (rapid eye movement) phase of sleep, which is associated with dreaming. However, they have another sleep phase that humans do not, known as USWS, in which one half of the brain sleeps while the other half is awake. Chickens can sleep with one eye open, an evolutionary adaptation that allows them to watch for predators as they sleep.
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To swim underwater, sloths can hold their breath for 40 minutes.
Cheetahs do not roar; instead, they meow and purr.
The horns of Rhinos are made up of the same stuff as our fingernails.
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A group of Tigers is called an ambush or streak
Sharks have a sixth sense.
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