If you're a big, big whale with a gigantic tail swimming through water, nothing gets in your way, not the water, not the other fish, not nothin'. You are so much bigger than the water molecules around you, you move through the sea the way humans move through the air on a calm day - you just go. Whales, I imagine, don't think much about water. All of a sudden you are much closer to the size of the water molecules around you.
Source: http://www.npr.org/blogs/krulwich/2013/10/04/229216417/comparing-sperm-whales-to-sperm-a-swimming-contest?ft=1&f=1007
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