In modern birds , such color patterning is used in communication and display , either to members of the same species ( e.g. for mating or territorial threat display ) or to threaten and warn off competing or predatory species .
In modern birds , such colour patterning is used in communication and display , either to members of the same species ( e.g. for mating or territorial threat display ) or to threaten and warn off competing or predatory species .