Seals are able to dive 1000 feet and can stay underwater for 30 minutes. They have more blood for their body size than any other land animal. They come on land or ice to mate. A seal's milk is forty-five to fifty percent fat. Because of this, some seals grpw extremely fast adding almost three pounds a day until they are weaned around three weeks of age. The grey seal's scientific name Halichoerus grypus comes from the Greek and means "hook-nosed sea pig." Sea lions can dive up to 475 feet deep and can stay under water for 20 minutes at a time.
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