Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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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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Penguins have a gland above their eye that turns saltwater into freshwater.
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There are approximately three chickens for every human on Earth.
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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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