Fig. 2From: Nest defense in the face of cuckoldry: evolutionary rather than facultative adaptation to chronic paternity lossa Intrusion pressure from brood predators was lower than that from territory competitors. b Males contributed relatively less than their female partners to defense against brood predators than to defense against territory competitors. Horizontal dashed line indicates 0.5 (i.e. an egalitarian split of defense against intruders). Both (a) and (b) depict values per territory summed across the three observation periodsBack to article page