reptiles are animals that produce egg and use the heat of the sun to keep it's blood warm, an animal such as frog that lives both on land and water but must produce its egg in water is called amphibian, mammals are animals in which the female gives birth to babies and not eggs and feed them on milk from her own body, gills are an organ through which fish and other water creatures breath, the hard pointed part of the birds mouth is called a beak, scales are thick pieces of hard skin on the bodies of fish, snakes and lizards,

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