Crocodiles continually grow new sets of teeth to replace old ones.
Crocodile teeth are very similar to humans. They have an adult tooth in their mouth, a replacement or "baby" tooth in waiting in case of a lost tooth, and then a stem cell that can become a replacement tooth if necessary.
Elephants use their ears to regulate their body temperature.
Horses can sleep standing up.
Crocodiles really do produce tears.
Hippopotamuses are born underwater.
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