Birds Are Laying Eggs Earlier Likely Due to Climate Change

In addition to that set of data, the researchers had information collected on eggs from 1990 to 2015 by Bill Strausberger, a research associate at the Field who studied cowbirds, and from Whelan, who had amassed modern songbird nesting data. They filled in any gaps in data by creating a statistical nesting model for those missing years. Then they compared the century-old egg information to the contemporary nesting details. They found that about one-third of the 72 bird species for which they had old and new data were nesting earlier in the year. The actual extent varied a bit among species.

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