Some birds are laying eggs earlier. Scientists are paying attention.
During a birdwatching stroll last spring, John Bates spotted a newly hatched killdeer chick. Common in North America, the long-legged birds often dart across the ground hunting for insects.
Bates noted the date: April 30. Killdeer eggs take about 24 days to hatch, so this youngster must have come from an egg laid at the beginning of April. That’s roughly one month earlier than birds were laying eggs a century ago — a big difference, says Bates.
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