The act of building and occupying a nest (by birds, insects, etc.). Often used as 営巣する (to nest).
春になると公園の桜の木にツバメが営巣する。
In spring, swallows build nests in the cherry trees of the park.
都市化で営巣場所を失った野鳥が減っている。
Wild birds that have lost nesting sites due to urbanization are declining.
調査班は海岸で営巣するウミガメの数を記録した。
The research team recorded the number of sea turtles nesting on the coast.