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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#.VS0agGf9kpE
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
Simmons R, Barnard P, Smith PC 1987. Reproductive Behaviour of Circus cyaneus in North America and Europe: A Comparison. Ornis Scandinavica 18 (1) 33-41
Website link:http://www.jstor.org/discover/10.2307/27669756?uid=4&sid=21100861900201
Barnard P, Simmons R, Jackson HD, Goodman SM, Cyrus DP, Herholdt JJ 1986. Short Notes. Ostrich: Journal of African Ornithology 57 (2) 107-114
Website link:http://www.tandfonline.com/doi/abs/10.1080/00306525.1986.9634133
Simmons R, Smith PC 1985. Do Northern Harriers (Circus cyaneus) choose nest sites adaptively?. Canadian Journal of Zoology 63 (3) 494-498
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