Bird or bat: comparing airframe design and flight performance

Bird or bat: comparing airframe design and flight performance

via IOPscience::.. Bird or bat: comparing airframe design and flight performance.

I read it and didn’t understand one thing – what is this article about? it reminds me this:

http://www.italki.com/groups/1492/topic/9841.htm

I believe that not everything in biology cannot be explained using fluid forces and aerodynamics. The question “why bats don’t migrate” could probably be answered not because “they have wrong wings and lift/drag ratio”, but mainly because “they don’t want to :-)”.

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