In addition to breeding birds, sometimes non-breeding rockfowl are present. These birds occasionally attempt infanticide to gain access to prime nesting sites or mates. Birds in these colonies often chase each other in circles, even through the treetops, a rare destination for this species.
In addition to raising offspring, some rockfowl occasionally attempt to eliminate their own young to gain priority access to prime breeding sites or mates. Birds within these groups often exhibit intense, circular chases, even venturing into the upper canopy, a behavior unusual for this species.