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