By Walker Brian G   Boersma P D.   in Canadian Journal of Zoology

ISSN:1480-3283|81|9|1471-1483

NRC Research Press‎(2003)‎

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By Boersma P.D.E.E.   Davis L.S.   in Animal Behaviour

ISSN:0003-3472|54|5|1047-1052

Elsevier‎(1997)‎

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