United Flight 2325 had departed Denver International Airport en route to Edmonton, Alberta, when the incident occurred.
LiveATC audio documents the flight crew asking that the plane be inspected for an engine fire and being told that it was a rabbit that apparently got sucked into an engine.
"Rabbit through the number 2, that'll do it," the pilot responded.
The Boeing 737-800 was carrying 153 passengers and six crew members.
