There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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The cat brain weighs about 30g.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Dogs have been man's pet for over 14,000 years.
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Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
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