Lori Larson (Daylily18) has some of the most amazing bird photography I've seen. As an added bonus, she uploads photos like this "biggee-sized"!

In addition to a great set of Bluebird photos, her sets include Woodpeckers, Warblers and Finches, Redpolls and Sparrows. It's not just birds though - be sure to check out her Nature, Macro and Explored set (slideshow).

Here's her Flickriver.

PS: For more about bluebirds, head over to Michigan Bluebird on Michigan in Pictures!