Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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A group of kittens is called a "kindle".
10
Cats recognise the voice of their owner, but never evolved to care.
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The elephant brain weighs about 6,000g.
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A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
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The largest breed of rabbit is the Flemish Giant.
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The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
21