I regularly use birds purchased at DAZ.

I have the eagle 2, eagle expansion pack (lots of birds of prey), and some birds by third party vendor Noggin who has seagulls, crows, pigeons, owls and geese. The native DAZ birds look very nice with elaborate feather transparency and very detailed textures. I find that Noggin has the habit of placing the eyes of his models too much on the side (especially true for the crows and seagulls), but otherwise they are quite good and include most of the poses you need.

You can also check out the songbird series also, for lots of smaller birds.

Fantasy pictures, free 3d models, 3d tutorials and seamless textures on Virtual Lands.