How Birds Fly, and muscles

http://www.learner.org/jnorth/tm/FlightLesson.html

http://palaeo.gly.bris.ac.uk/macro/pterosaurs.html

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Image result for quetzalcoatlus muscles

https://pterosaur.net/flight.php

Quetzalcoatalus Northropi Muscle Study by TheDragonofDoom.deviantart.com on…:

Image result for bird muscle

 

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