An OC Transpo employee made the cute discovery at a bus parking garage on Industrial Avenue in Ottawa's east end.
The bus was parked in the garage for regular maintenance, and the fox got inside through the door of the bus, which had been left open.
The employee took a photo of the sleeping fox, and CBC reporter Stu Mills later obtained the photo and tweeted it out. Within minutes, it had been re-tweeted hundreds of times.
Later, OC Transpo posted a message on its Twitter feed that the fox left the bus on its own after getting some shut-eye.