blue whale (Balaenoptera musculus) The Common Rorqual Whale (Balaenoptera musculus)
Date	1903
Source	http://www.flickr.com/photos/biodivlibrary/6358178351
Author	Harry Hamilton Johnston
Full title	British mammals; an attempt to describe and illustrate the mammalian fauna of the British islands from the commencement of the Pleistocene period down to the present day, by Sir Harry Johnston.
Source: https://commons.wikimedia.org/wiki/File:British_mammals_(6358178351).jpg
The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whales (Mysticeti). It is the largest animal known to have ever existed. Blue whales were abundant in nearly all the oceans on Earth but their numbers have been greatly reduced due to whaling.