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Seals
Seals are carnivorous animals modified for life in the water. To this end their bodies are cylindrical, tapering away from the middle; the limbs are short with the feet flattened and webbed for swimming, the forward pair acting as paddles and the hinder ones, which are placed close together and permanently directed backward, forming a rudder or propeller. Seals have no external ears and the first or "milk-teeth" are never fully developed, being generally absorbed before birth.