Ron Deviney has nice bird brushes, he say in promo

Many times I am needing something to finish out a illustration that might be a outdoor scene, maybe a few birds or trees to help. I created these just for that reason.

Yes, there are flying birds, flocks of birds, sitting Birds, birds on power lines, birds in trees, plus a few trees and branches.

I think you will find these useful and handy in helping bring your layouts to life!

 

you can see details at http://www.daz3d.com/i/shop/itemdetails/?item=8330 

there are very reasonable, imho