While at first glance, eastern and western bluebirds may appear similar, there are notable differences. Notice on this male eastern bluebird (above) how bright white the belly is! Compared to the ...

two Western bluebirds, a male (with vibrant rust-colored breast) and a female (lighter colored rust and blue), fight a tree swallow (dark blue wings and white breast) for occupancy of this bird house.

If you are a western bluebird trying to expand your range in the rough-and-tumble forests of Montana, it helps to be an aggressive male. And if you want to have an aggressive male, it helps to ...

Western and eastern bluebirds both have rusty-red breasts. The eastern shows a bright white belly and the western shows a blue belly. Females of both species show a subdued rusty chest ...

In the eastern half of the state, we have breeding eastern bluebirds, and in the western part of the state, we have breeding western bluebirds. They are very pretty birds with blue heads ...