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Bill knob size and reproductive effort in Common Shelducks Tadorna tadorna

P. N. Ferns, Auteur ; J. P. Reed, Auteur ; E. D. Gregg, Auteur ; C. O'Hara, Auteur ; A. Lang, Auteur ; G. R. Sinkowski, Auteur

Dans Wildfowl (55 2005)

Male Common Shelducks Tadorna tadorna with Large bill knobs were more effective at defending spring feeding areas in the Severn Estuary, southwest England, against other males than those with small bill knobs. Their female partners were conseque[...]

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