The squirrel kept launching itself from an 8-foot-high wall-mounted lamp into a glass wall after becoming trapped in a trauma room at Robert Wood Johnson University Hospital in Rahway Tuesday night.
Fire Department spokesman Capt. Ted Padavano told The Star-Ledger of Newark it would climb up on a light and would jump off and glide.
A pair of firefighters threw a blanket over the squirrel and released it into a wooded area outside the hospital.
Padavano believes there may be a nest in the building because it's the second time in two weeks that a flying squirrel got in the ER.