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Dean WRJ, Barnard P, Anderson MD 2009. When to stay, when to go: trade-offs for southern African arid-zone birds in times of drought. South Africa Journal of Science 105 24-28
Simmons RE, Barnard P, Dean WRJ, Midgley GF, Thuiller W, Hughes G 2004. Climate change and birds: perspectives and prospects from southern Africa. Ostrich: Journal of African Ornithology 75 (4) 295-308
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
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

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