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Migration in the West is much different than that in the East, both in density and species composition. For instance, while Setophaga townsendi (Townsend’s Warbler) are common in the West, they do not migrate through the East. Photo by Dylan Osterhaus
Migration in the West is much different than that in the East, both in density and species composition. For instance, while Setophaga townsendi (Townsend’s Warbler) are common in the West, they do not migrate through the East. Photo by Dylan Osterhaus

Using weather radar and automated flight call monitoring to sample migration in the American West

How to describe something we cannot see? This challenge defines nocturnal bird migration research. Every spring and fall, millions of birds fly through the night, journeying between wintering and breeding grounds.