Black-necked grebes build their nests at the edge of the water, this is because of their difficulty when it comes to walking. The pair will select a suitable nesting site together and will then build it together. The nests are usually built on a foundation of bent over reeds when available. They will dive to find plant matter on the bottom of a lake and then lay it on the nesting site. This will be repeated many times until they're left with a pyramid-shaped pile. Females will usually lay between 3 and 4 eggs that go from being light blue to white and then to a dark brown colour. Both sexes will incubate the eggs for around 3 weeks.