Spring is Advancing Unevenly Across North America (1 of 3) (IMAGE)

PLOS

Spring is Advancing Unevenly Across North America (1 of 3)

Caption

Migratory birds face a variety of changing spring conditions, as demonstrated by spatial trends in the first leaf index within breeding and wintering ('non-breeding') areas for the whooping crane (Grus americana) and the blue-winged warbler (Vermivora cyanoptera).

Credit

Waller et al. 2018

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