As global climate change causes spring to start earlier, birds such as western tanagers are arriving at their destination after what's known as 'green-up,' when flowers begin blooming and insects emerge.
The study found that spring is indeed beginning earlier along birds' migration routes, leading to a timing mismatch between migrants and their food sources.
In discussing climate change, we often focus on warming. But the length and timing of seasons... are some of the most dramatic effects of climate change.
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