Anchorage Police Lt. Dave Parker said officers are not sure how the remains got on top of the building. He said it could be a prank, or that someone decided to skin a moose under the midtown Anchorage sky.
He said it would have been possible for someone to fling the remains to the top of the one-story building.
Parker said the spinal column and ribs had been there awhile.
The Anchorage Daily News reports the building's maintenance crew will be responsible for removal.
Information from: Anchorage Daily News, http://www.adn.com