To get a feel for what this expansion actually looks like in one place, see the graphs below from Christmas Bird Counts. Like many species, Tufted Titmouse has especially expanded northeast up the St. See a graph of this at my previous post here. Carolina Wren is a classic example of a species knocked back by harsh winters, finding some refuge around bird feeders, and then continuing to expand in warmer winters. To draw the lines, my intent was to capture the primary range area - and more - but I deliberately excluded the furthest ten to fifteen outliers for each line.ĬLICK TO ENLARGE GRAPHICS Northern Cardinals (once called Kentucky Cardinals) have been expanding north for decades, but have increased their rate. I created these maps using eBird, so the usual caveats apply– they don’t necessarily include all records (though many historical out-of-range records are indeed included), and eBird reporting, which became widespread only after 2010, continues to increase dramatically each year. This seems to be primarily driven by warmer winters and, for some species, is further augmented by bird feeders. ![]() ![]() While there are tremendous species-specific differences, non-migratory resident birds (such as Northern Cardinal, Carolina Wren, Tufted Titmouse, and Red-bellied Woodpecker) appear to be the most adaptable and have expanded their ranges the most. These papers usually present aggregated results from dozens of species they rarely provide details for any specific species. A number of recent academic papers have described northward shifts of bird species in both North America and Europe, driven by climate change.
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