It takes 5 years for an oyster to produce a medium-sized pearl.
Freshwater pearls can take between 1 and 6 years to form; whereas saltwater may take between 5 and 20 years. The longer a pearl stays in the shell, the more nacre that forms, and the larger the pearl.
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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