Image: Unnatural selection, 2 heads, one species
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Description: Canis lupus. Each skull was photographed from the same focal distance with a fixed zoom; the images were then combined while preserving scale. The larger skull is from a wild grey wolf. The smaller is from a chihuahua. They are in fact considered the same species. The domestic dog is the product of artificial selection over many generations. Suitable example for evolution or general biology.
Title: Unnatural selection, 2 heads, one species
Credit: Own work
Author: Dmccabe
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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