[srikz]

This video about Biomimicry is a great accompaniment for this article

https://www.youtube.com/watch?v=iMtXqTmfta0

[starpilot]

Bird wings are actually optimized for different Reynolds numbers (https://en.wikipedia.org/wiki/Reynolds_number). More flapping for smaller birds/insects, more gliding for larger (they fly like airplanes almost).

[nigerian1981]

Great video thanks for sharing