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17 February 2020
Northern Harriers Have a Geographically Broad Four-Year Migration Cycle
David J. Schimpf,
Laurie J. Goodrich,
Alison R. Kocek,
David A. La Puma
Journal of Raptor Research
Vol. 54 • No. 1
February 2020
Vol. 54 • No. 1
February 2020
Circus hudsonius
long-term study
migration
Northern Harrier
predator cycle
regional ecology
Spatial synchrony