Biologists have identified for the first time, a key photoreceptor cell deep inside the brain of birds, which takes the role of eyes in humans by directly responding to light and regulates breeding activity according to seasonal changes.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/Tzz-NPRuxLo/140708103103.htm
Shining light on the 100-year mystery of birds sensing spring for offspring
8 julio 2014
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