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In page Grebe:

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Grebes are perhaps best known for their elaborate courtship displays. Most species perform a duet together, and many have their synchronized rituals. Some, like those species in the genus Podiceps, do a "penguin dance" where the male and female stand upright, with their chests puffed out, and run along the water's surface. A similar ritual in other species is the "weed dance", in which both partners hold pieces of aquatic vegetation in their bills and are positioned upright towards each other. There is also the "weed rush", in which partners swim towards each other, necks stretched out with weeds in their bills, and just before colliding, position themselves upright and then swim in parallel.[citation needed]