This area is a 'nesting' ground/place/site for seagulls. [=this is a place where seagulls build nests and raise their young]
Their children will soon be ready to 'leave/flee the nest'. [=their children will soon be ready to move away from home]
His comments stirred up a 'hornet's nest' of angry opposition and criticism.
(..) You give our position one more time, I'll bleed you, real quiet, and leave you here. Got that? Fuck you. He killed one of the hostages. We move. Mac, Blain - the nest. Billy, Poncho - the guard. Hawkins, Dillon - backup. As soon as they're set, I hit the fuel dump. One down. (..)1987 Predator