"Never Smile at a Crocodile.."
			The Nile Crocodile (Crocodylus niloticus), like all members of the Family Crocodylidae, has a notch in the upper jaw on each side that holds the 4th tooth in the lower jaw when the mouth is closed. It also possesses salt glands on the tongue to excrete excess salts. Even those in totally fresh water have these.
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