They [the boys] all had catapults […]. In summer they used to go fishing and bird-nesting.
(US) A custody arrangement in which the child of divorced parents remains in one home while the parents take turns to move in and out.
2007, Gayle Rosenwald Smith, What Every Woman Should Know about Divorce and Custody:
An unusual, but not unheard of, setup called bird nesting is when children stay in the house and the parents take turns moving in and out.
2017, Etta Faire, Feliz Navi-Dead: A Sketchy Matchmaker Mystery:
He should feel lucky I agreed to test out this bird-nesting custody arrangement this month. It was a huge inconvenience for me to have the kids staying full time in the house while Mark and I traded time living there.