Massive Migrations
About 2 billion birds cross the Gulf of Mexico during the spring migration season, according to a new study that combined data from 11 weather radar stations and observations from citizen scientists.
Researcher Kyle Horton of Cornell University’s Lab of Ornithology said that before he and his colleagues looked at the data from 1995 to 2015, “we could only guess at the overall numbers from surveys done along small portions of the shoreline.”
Horton says that while climate change has caused the earliest seasonal migrations to begin 1.5 days earlier per decade, the peak has remained at the same period between April 19 and May 7.
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