Predation risk is unlikely to account for the failure of subordinate speckled warblers Chthonicola sagittata to help at the nest
The predator avoidance hypothesis suggests that the failure of subordinate birds to provision nestlings in communally breeding species is a consequence of increased predation risk. Parents exclude subordinates from the nest area and thus reduce the frequency of predator-attracting visits when the nest is most vulnerable, leading to increased reproductive success. I evaluated this hypothesis for the speckled warbler Chthonicola sagittata, a group-living member of the Pardalotidae in which...[Show more]
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|Source:||Journal of Avian Biology|
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