Fighting and assessment in the yellow-rumped cacique (Cacicus cela)

摘要: I tested the prediction derived from game theory models that intensity of aggressive interactions should reflect value resource being contested and disparity in fighting ability contestants. Females yellow-rumped cacique compete for nest sites material to build nests. competing established engage higher than those which building has not begun against females robbing (Fig. 1). For males, access is determined by dominance, positively correlated with weight. Comparably-sized males 2) similar rank 3) significantly more intense differ widely size or rank.