Most of us using GIS today do not get to do much mapping of whales, but back in the mid 19th century the American whaling trade was big business and you needed to know where the whales were.

Check out this innovative map from 1851 showing the distribution of several different species of whales, identifying each with a combination of color and pictorial symbols.  The map shows at that time that the Pacific Ocean was the primary habitat for whales.  The Atlantic Ocean was not because the whale resources there had been terribly depleted.  Check it out!