By 16 million years ago, the neck of the common ancestor of the okapi and the giraffe had elongated compared with its predecessors.
By 16 million years ago, the neck of the common ancestor of the okapi and the giraffe had elongated compared with its predecessors.
Source:LiveScience
Source: http://www.livescience.com/52405-here-s-how-the-giraffe-got-its-long-neck-infographic.html
