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Re: 11th specimen of Archaeopteryx

 This is certainly not impossible, but it should be noted that any
 model suggesting a "limited flapping" precursor needs to consider the
 potential for appropriately manipulating vorticity on the wing (and,
 in this case, rapidly increasing circulation and abruptly reducing it
 - otherwise, the animal loses more than it gains). I have yet to see
 this even whispered in the literature with regards to early birds,
 which is pretty concerning.


 --Mike H.

By "increasing circulation", do you mean a downstroke or an upstroke or...?