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LIVING THINGS
How animals survive
Unlike plants, which cannot move and have to protect themselves where they grow, animals can move about to find food and protect themselves.
Wild animals are very sensible about what they eat. Just like us, they sense that some foods are good for them. They know that their bodies can only digest certain foods. This is why animals search for the foods that suit them best. An animal will starve if it cannot find suitable food, even if there are other types of food around.
  This is the skull of a deer. Deer feed entirely on plants and need to be able to cut and grind the tough fibres in their food.
The incisors and canines are only present in the lower jaw. The upper jaw has a tough pad. The teeth and the pad act like a knife and chopping board when the animal bites grass. The back teeth have many ridges which grind up the food as the jaw moves from side to side.
Plant eaters
Many animals can only get the correct diet by eating plants (picture ). Some of the world’s largest animals, such as the elephant and the giraffe, are plant eaters (herbivores).
There are large numbers of plant eaters in every part of the world. These may be insects such as grasshoppers, seed-eating birds such as finches, or small animals such as squirrels, which eat fruits, nuts and the bark from trees (picture ).
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Molars
Incisors and canines