You can get the songbird at Daz

http://www.daz3d.com/i/3d-models/-/songbird?item=719&_m=d

The Hummingbird at RDNA

http://www.runtimedna.com/RDNA-Humming-Bird.html

Ken used to have some free birds at his site, not sure if they are still available:

http://www.empken.com/

Here is a search for "bird" at Mystic Nights 3D Directory. You might find something free there:

http://mystic-nights.com/directory/index.php?PHPSESSID=28bc148aefa22395d63566c4942d587e

I can't get to it right now, but you can type in a search word at this link and find both free and commercial items:

http://www.whatever3d.com/

And finally, Turbosquid has some free and commercial ones

http://www.turbosquid.com/Search/3D-Models/bird

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi