Assertion: fur seal's pup | /r/CapableOf | gain over 2.2 kilograms 4.9 lbper day
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text: Harp seal milk initially contains 25% fat (this number increases to 40% by weaning as the mother fasts) and pups gain over 2.2 kilograms (4.9 lb) per day while nursing, quickly thickening their blubber layer.