sentences:  Throughout the last century a number of birds have expanded their range.Birds that were once thought to be only located on the West Coast of have moved eastward all the way to the East Coast, an example would be the Brewer's blackbird.Since the 1950s the Brewer's blackbird, a relative of the red-winged blackbird, has been moving eastward first from the West Coast of Oregon and California to the Great Lakes Region and then towards the East Coast, with the range expanding from Coast to Coast according to the Audubon's 2005 Christmas Bird Count.