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The influence of microtines on polygyny, productivity, age, and provisioning of breeding Northern Harriers: a 5-year study

by Simmons, Robert, Barnard, Phoebe, MacWhirter, Bruce, Hansen, Gay L.
Published in Canadian Journal of Zoology (1986)

Timing of breeding and the seasonal importance of passerine prey to northern harriers ( Circus cyaneus )

by Barnard, Phoebe, MacWhirter, Bruce, Simmons, Robert, Hansen, Gay L., Smith, P. C.
Published in Canadian Journal of Zoology (1987)

northern harrier

Published 1991

northern harrier

Published 1991

northern harrier

Published 1991

northern harrier

Published 1991

northern harrier

Published 1991

northern harrier

Published 1991

northern harrier

Published 1991

northern harrier

Published 1991

northern harrier

Published 1991

northern harrier

Published 1991

northern harrier

Published 1991