It seems that a bunch of scientists got together and decided it would be educational to monitor the testosterone levels in dark-eyed juncos, birds common in North America, in order to better understand the range of their observed mating behavior. Their intriguing behavior involves two, distinct father types for the birds. One type is more dedicated to helping to rear his young and less to mating as many times as possible with different females, and the other is exactly the opposite. Read on for why they think this makes evolutionary sense.

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Tags: biology, Birds, dark-eyed juncos, genetics, ornithology

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