D. Philip Whitfield, Will Cresswell, N. Philip Ashmole, Nigel A. Clark, Andrew D. Evans, No Evidence for Sparrowhawks Selecting Redshanks According to Size or Condition, Journal of Avian Biology, Vol. 30, No. 1 (Mar., 1999), pp. 31-39
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Whitfield et al. (1999) studied this question.
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