Elephants have large, thin ears. Their ears are made up of a complex network of blood vessels which help regulate their temperature. Blood is circulated through their ears to cool them down in hot climates.
The South American degu, a small rodent, uses urine to mark its passageways. Its urine reflects ultraviolet light, which the degu can see.
The reason why hair turns gray as we age is because the pigment cells in the hair follicle start to die, which is responsible for producing "melanin" which gives the hair colour.
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