1. Tortoises, turtles and snails have shells for protection against predators.
2. Tusks are elongated, continuously growing front teeth, usually but not always in pairs, that protrude well beyond the mouth of certain mammal species like elephants.
3. The skin of most types of fish is covered by scales.
4. The beak, is used by birds for eating, grooming, manipulating objects, killing prey, fighting, probing for food, courtship and feeding young.
5. Cats, lions, mice, foxes and many other mammals and primates (except humans) have whiskers at the side of their mouths for tactile sensation.


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