A skilled hunter, the Pitt Island shag dives for fish and marine invertebrates, moving through the water with its large, webbed feet. After a fishing session it returns to land to dry out its wings, holding them out towards the sun. Unlike most waterbirds, the feathers are not waterproof; this is thought to be an adaptation to aid diving, as the shags are not kept buoyant by air bubbles amongst the feathers (2).
Shags breed in colonies on rocky shores once a year, the female laying chalky blue eggs in a loose nest while her partner stands guard or fishes. The young are fed by both parents, who regurgitate the contents of their stomachs on demand (2).