nidification (n.)

"nest-building, the act or art of constructing nests," 1650s, from Latin nidificatus, past participle of nidificare, from nidus "a nest" (see nest (n.)) + -ficare, combining form of facere "to make," from PIE root *dhe- "to set, put." Related: Nidify "to build a nest" (1650s).