Early spring doesn’t bring early birds, Canadian research shows

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开始时间 2013-06-04

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2013-06-04

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When spring comes early, migrating birds still arrive at their regular time, York University research shows. They miss the best breeding time in a world with increasingly early springs. OTTAWA — The spring of 2012 was the earliest on record, shattering heat records across Eastern North America. But many common songbirds didn’t migrate early to take advantage.

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