The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Penguins have a gland above their eye that turns saltwater into freshwater.
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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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