The roommates called police about the head Sunday, and investigators quickly ruled out one obvious potential source: the beloved buffalo mascot named Ralphie at the University of Colorado.
Police spokeswoman Kim Kobel said Monday that the head came from a buffalo recently slaughtered from a ranch in Nebraska. The head's owner told police he was drying out his souvenir so he could display it on a wall.
Kobel says the case is now closed.
Police didn't release the names of the people involved.