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Echidnas are small mammals that are covered with coarse hair and spines. Superficially they resemble both the anteaters of South America and other spiny mammals like hedgehogs and porcupines. They have snouts which have the functions of both the mouth and nose. Their snouts are elongated and slender. They have very short, strong limbs with large claws and are powerful diggers. Echidnas have a tiny mouth and a toothless jaw.