Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Cats recognise the voice of their owner, but never evolved to care.
22
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
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