noun, noun or participle which takes 'suru', intransitive verb
brooding; sitting on eggs; nesting
Ornithological term for a bird settling on a nest to incubate eggs. Used as a noun or with する for the action.
ツバメが軒下で就巣している。
A swallow is brooding under the eaves.
就巣期間中
During the brooding period, it is necessary to leave the parent bird undisturbed.