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A pied-flycatcher.

A pied-flycatcher on a branch

Because day length is unaffected by climate change, some long-distance migrators such as the pied-flycatcher, whose main migratory cue is day length, have maintained fairly consistent arrival times at spring breeding grounds. Yet, spring temperatures are arriving earlier in the year. So these migrators are missing insect population peaks upon which they previously feasted. With less to eat, these migrators are producing fewer chicks.

Credit: Mark Medcalf, licensed under the Creative Commons Attribution 2.0 Generic license

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