• Spring Comes Earlier

    25 days ago - By Ornithology

    In case you haven't noticed, spring is coming earlier these days. Looking at climate data over the past century, spring temperatures are arriving three to six days earlier in the southern states and four to seven days early in the northern states. And similar patterns are observed across the planet. Sure, it's nice when spring arrives, pushing that nasty old winter aside. Except for migratory birds.
    You see, migratory birds have evolved to time their migration to the photoperiod, that is, the day length. As the days shorten, birds head south; as the days get longer, they go north. If birds...
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