When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
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Cows can sleep standing up, but they can only dream lying down.
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In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
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It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
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Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17