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.
Occasionally, birds that are not involved in reproduction coexist with those that are. These birds may resort to killing their young to secure desirable breeding locations or partners. In these colonies, birds frequently engage in frantic, aerial chases, even penetrating the treetops, a behavior uncommon for this species.