Have sweat glands, Their young feed on milk from their mother, Are homeothermic, Skin covered with scales, have gills, have fins, Soft moist skin, The larvae have gills, Adults have lungs, lay eggs in water, Dry skin with scales, lays eggs, Has wings, has antennae, body is divided into three parts., Has four pairs of legs, has no antennae, Some have shells, have an un segmented body, Has feathers, has a beak, lay eggs., Has waterproof exoskeleton, segmented body, several pairs of jointed legs.,

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