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Harp seals
This species of seals have the difficulty of raising their young ones in the ice covered environments which are inhabited by polar bears whose main pray are the seals. The female seals also go to the extent of spending up to 12 days breastfeeding their infants without eating anything. It is at this time that the females lose approximately 7 pounds of fats while the infants gain up to 5 pounds of fats within a fortnight of their birth. Mother-infant relationship of seals continues until when they can independently survive on their own.
