english sparrows, starlings, feral pigeons. i believe these are pretty much an open season since they are considered pests. another category of birds is songbirds, they are all protected.

mockingbirds, those are considered songbirds. so are cardinals, robins, finches, etc. don't even think about shooting a songbird. and don't shoot raptors (hawks, owls, falcons, etc), and dont' shoot birds that eat mosquitoes (purple martins).

english sparrows, starlings, feral pigeons...shoot them until your heart is content. you can probably shoot blackbirds too, but i'm not sure of your state regulations.