三趾鸥

• Black-legged kittiwake chicks have a crossbar on their neck that has a calming effect on an agitated conspecific. Young birds retain this signal for a long time.
• Black-legged kittiwake chicks mimic bird droppings by staying in the nest and not moving, to avoid predators. Their light coloration and almost complete immobility allow them to be mistaken for droppings by flying predators.
• Young black-legged kittiwakes have a light gray back. Unlike young black-legged gulls, which have a different back color, they can be confused at a distance.