Birds in Flight

For my animation I am going to need to understand the movement of birds in flight.

This page has heaps of useful information about the movements of different birds, how the wings move and rigging information as well as video reference and animation examples.  I think this will be a really good resource.

I've also been looking for reference imagery and videos.  Here are some I have found of the Martial Eagle.  Some have really terrible footage, but contain moments of flight or movement that could be useful.

There's also some stock footage here