The male selects a territory, which he defends against conspecifics, and re-establishes a pair bond with his mate or attracts a new female if necessary. Courtship involves ritualised flight and ground displays, and the male often presents a fish to his partner. Most species have little or no nest, laying the eggs onto bare ground, but Trudeau's tern, Forster's tern and the marsh terns construct floating nests from the vegetation in their wetland habitats. Black and lesser noddies build nests of twigs, feathers and excreta on tree branches, and brown, blue, and grey noddies make rough platforms of grass and seaweed on cliff ledges, in cavities or on other rocky surfaces. The Inca tern nests in crevices, caves and disused burrows, such as that of a Humboldt penguin. The white tern is unique in that it lays its single egg on a bare tree branch.