Yellow Warbler with collision injury, photo by Scott Diehl

Threats to Migratory Birds

The most vulnerable time in a migratory bird’s life cycle may occur during spring and fall when it is traveling between its breeding and wintering grounds.  During migration, birds are under physiological stress and mortality rates may be higher than during stationary periods.  Several factors that may contribute to stress and high mortality rates include:

Wisconsin Night Guardians for Songbirds
Wisconsin Night Guardians for Songbirds

For more information on these topics, please see our Links and Technical Resources pages.

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