• Why Don't Some Warblers Nest Farther West? Maybe It's Just Too Tough to Get There

    5 monthes ago - By All About Birds

    A Cape May Warbler in Quebec. Photo by Suzanne Labbé/Macaulay Library .
    A flip through the range maps in any field guide shows blocks of color indicating where a species spends its summers, winters, and points in between. But why does a species occur where it does? What limits its range? People have debated this idea for at least a century-the field even has its own name, “biogeography.” And recently David Toews, a postdoctoral associate at the Cornell Lab of Ornithology, added a new idea to the list.
    Toews looked at the ranges of North American warblers and noticed an interesting pattern...
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