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Barnard P, MacWhirter B, Simmons R, Hansen GL, Smith PC 1987. Timing of breeding and the seasonal importance of passerine prey to northern harriers (Circus cyaneus). Canadian Journal of Zoology 65 (8) 1942-1946
Website link:http://www.nrcresearchpress.com/doi/abs/10.1139/z87-295
Barnard P, MacWhirter B, Simmons R, Hansen GL, Smith PC 1987. Timing of breeding and the seasonal importance of passerine prey to Northern Harriers (Circus cyaneus). Canadian Journal of Zoology 65 (8) 1942 - 1946
Website link:http://www.nrcresearchpress.com/doi/abs/10.1139/z87-295#.VS0agGf9kpE
Simmons RE, Smith PC, Macwhirter RB 1986. Hierarchies among Northern Harrier (Circus cyaneus) harems and the costs of polygyny. Journal of Animal Ecology 55 (3) 755 - 771
Website link:http://www.jstor.org/stable/4414
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