News From the Field
'Green wave' explains migratory bird routes
September 11, 2014
This material is available primarily for archival purposes. Telephone numbers or other contact information may be out of date; please see current contact information at media contacts.A new study shows bird migrations follow areas of new plant growth--a so-called "green wave" of new leaves and numerous insects. In fall, particularly in the Western U.S., they stick to higher elevations and head directly southward, making fewer detours along the way for food.Full Story
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