The Collaborative International Dictionary of English v.0.48:

Nidulate \Nid"u*late\, v. i. [imp. & p. p. Nidulated; p. pr. &
   vb. n. Nidulating.] [L. nidulari, fr. nidulus, dim. of
   nidus a nest.]
   To make a nest, as a bird. [R.] --Cockeram.
   [1913 Webster]