The Collaborative International Dictionary
Nidificating
Nidificate \Nid"i*fi*cate\, v. i. [imp. & p. p. Nidificated; p. pr. & vb. n. Nidificating.] [L. nidificare, nidificatum; nidus nest + -ficare (in comp.) to make. See -fy, and cf. nest.] To make a nest.
Where are the fishes which nidificated in trees?
--Lowell.
Wiktionary
nidificating
vb. (present participle of nidificate English)