Tree Sparrow CBC Data - U.S and Canada

Sorry to clutter things with graphs - but this one more, of American Tree Sparrow for the entire U.S. and Canada, illustrates this species' decline. Ignore count year 59 on these graphs, by the way, there is obviously a problem with that year's online data. See below for more on Cape May tree sparrows.

National Audubon Society (2010). The Christmas Bird Count Historical Results [Online]. Available at http://www.audubon.org/bird/cbc [February 11, 2010]