Black Grouse (Tetrao tetrix) Science Article 6
abstract
We studied supra-orbital combs in lekking black grouse (Tetrao tetrix) in relation to sexual selection at five leks in Finland 1991-1998 and four leks in Sweden 1992-1995. Comb size was estimated in two ways: by observing its natural size in the field at different behaviors (‘observed comb size’), and by measuring the comb size from captured birds
Rintamaki PT et al, Behav Ecol 11:465-471