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ScienceDaily reports

California birds nesting a week earlier than they did a century ago

Earlier breeding allows birds to raise young at cooler temperatures, avoiding warming climes

Many birds are adjusting their life styles to breed 5-12 days earlier to avoid warming that has occurred since the early 1900s, an ongoing survey of California birds and comparison with century-old data shows. This strategy, combined with the trend of other birds to move northward in range or upward in elevation, allows adaptation to climate change, though eventually the cool window for breeding may become too short for some species.

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