The Bewick's Wren comes to the feeder at full speed, grabs what she wants, and flies off in a flash. I've been trying for a year to get a crisp photo of one these little bolts of lightning and finally managed one the other day.
Here's some information from the Audubon Field Guide:
"In dry thickets and open woods of the west, this is often a very common bird. Pairs of Bewick's Wrens (pronounced like "Buick") clamber about actively in the brush, exploring tangles and bark crevices, waving their long tails about, giving harsh scolding notes at any provocation. In the east, this species is far less common, and it has vanished from most of its former range east of the Mississippi River."