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The Bridled Tern is a common visitor to Rottnest to breed. It forms small colonies and nests on the ground usually in areas sheltered by plants, ledges or caves. This helps protect their nests from predators and the weather.
These birds search for food on their own or in small groups. They fly close to the surface of the sea dipping their head and breast in to catch their prey. They occasionally plunge at a steep angle into the water from 2-13m up, but they rarely go completely unwater.