Blue whale

Blue whales are the largest animals ever to have lived - bigger even than the largest of the . These jumbo-jet-sized giants inhabit the , where they are found most frequently along the continental shelf edges and near polar ice. A single calf is produced every two to three years, and from birth each calf consumes up to 50 gallons of milk every single day, leading to a colossal weight gain of 90 kilograms per day in its first year of life.


A blue whale's blood vessels are wide enough for a human to swim through.

Source: http://www.bbc.co.uk/nature/life/Blue_Whale

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