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Castoridae are large animals, reaching over 30 kilograms in weight. The body is insulated by fine underfur protected by long guard hairs. They frequently swim and dive for long periods in icy water. The large hind feet are Web. The smalle eyes have nictitating membranes (Membranes that arise at the inner angle of the eye and can be drawn across the eyeball), and the nostrale and ear openings are valvular and thus can be closed during submersion
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