Officials at Big Bend National Park in West Texas are looking for a mountain lion that attacked and injured a 6-year-old boy as he walked with three other people.
Park spokesman David Elkowitz says the boy was treated for puncture wounds and scratches and released from a hospital in Alpine.
The lion remains on the loose.
Rangers began evacuating trails and campsites early Monday. Closed areas include the Chisos Basin, Window Trail, the Pinnacles, Boulder Meadow and Juniper Flats.
Elkowitz says the young boy was walking near the park's lodge with three other people Sunday evening when he was attacked by a "young lion in very poor condition." The boy's name wasn't released.
Elkowitz says the animal that attacked the boy will be killed if found.