I finally finished my wings and flight tutorial! Feel free to download it for personal use, but please do not repost this tutorial without my permission.
One thing to keep in mind is that my drawing of the flight muscles has been modified to allow you to see the supracoracoideus. In real life, it would be packed under the pectoralis, which would touch the furcula. The furcula is springy and absorbs energy as the flight muscles push against it; it also serves as a brace to support the thoracic skeleton during flight.
In the reference folder of my gallery, you'll find a few other tutorials and lots of bird reference, including one on raptor feet, which might be of interest to people drawing hawks, gryphons, etc: [link] The rest of my photography is not stock. If you want to sketch from my pictures, that's fine--just credit the original photo if you upload your drawing online.
The Feather Atlas is a growing resource of high quality feather scans by the US Fish and Wildlife Forensics Laboratory. It is a great place to learn about feather shapes, particularly if you want to compare the difference in shape between the feathers on two very different types of birds (like a seagull and sparrow). [link]
Some slow-motion videos of birds can be found at these links. Youtube uploader Ultraslo is an especially good resource: [link][link][link][link][link][link]
This is amazing! The part about birds was helpful enough on its own, but then I see the added bonus of a griffin tutorial! Thanks so much for doing this, it made designing a (believable!) griffin a lot easier!
This is amazing. I'm going to favourite it for future reference. Wings have always given me trouble, and so I really appreciate you taking the time to make a tutorial.