Lewis & Short

nīdŭlor, āri, v. dep. n. and a. [nidus].

  1. I. Neutr., to build a nest: halcyones hieme in aquā nidulantur, Varr. ap. Non. 145, 7; and Gell. 3, 10, 5; 2, 29, 4.
  2. * II. Act. aliquem, to make a nest for one: contra rigorem hiemis vermiculos fetus sui nidulantur, Plin. 11, 28, 34, § 98.