5. GROUPING BIRDS Birds can be grouped by where they live - land birds, water birds, Arctic birds, tropical birds. Birds can be grouped by what they eat - birds that eat insects, birds that eat fruits and seeds, birds that eat meat and fish. Birds can also be grouped according to the shape of their feet, beaks or wings.
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8. MAMMALS Mammals are the most intelligent creatures on earth. They learn to adapt to many different climates and living conditions. Some mammals are tame, some are wild, some are very large and some are small.