The warden service is investigating the illegal killing of a moose east of Jackman.
They're offering a $2,500 reward for information that leads to the prosecution of the person responsible.
The warden service was called by someone who found the cow moose and reported that it had been shot and left to waste.
It happened in zone 8 and game officials say no cow permits had been issued for that zone.
Someone shot the animal and covered it with tree boughs to try to hide it.
Anyone with information is asked to call 1-800-alert-us or call the Piscataquis County Sheriff's Department at 564-3304.