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(NBC News)   Swallows evolve shorter wings to avoid cars, grip it by the husk   (science.nbcnews.com) divider line 2
    More: Interesting, University of Tulsa, urban areas, University of Nebraska, NBC News  
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3103 clicks; posted to Main » on 19 Mar 2013 at 5:37 AM (1 year ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2013-03-19 05:40:10 AM
2 votes:
It's not that they evolved shorter wings, it's that having shorter wings is in the given environment more advantageous for survival. Thus those individuals with short wings are more likely to reproduce and reproduce more often, leading to even more short winged individuals in the population. And that change in the frequency of a trait in response to an environmental pressure is what evolution is.
2013-03-19 05:51:15 AM
1 votes:

WhyteRaven74: It's not that they evolved shorter wings, it's that having shorter wings is in the given environment more advantageous for survival. Thus those individuals with short wings are more likely to reproduce and reproduce more often, leading to even more short winged individuals in the population. And that change in the frequency of a trait in response to an environmental pressure is what evolution is.


Ergo: they evolved shorter wings.
 
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