The Basenji dog is the only dog that is not able to bark.
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Lurch, a Watusi bull, had the largest horns in the world.
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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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Cats recognise the voice of their owner, but never evolved to care.
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It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
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When Koko, the gorilla famous for knowing sign language, was asked where gorillas go after death, she responded by signing “Comfortable hole, bye.”
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