The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
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Cats recognise the voice of their owner, but never evolved to care.
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The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
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When a male honey bee climaxes during sex, his testicles explode and then he dies.
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