Presentation of a very rare monster case in the sheep was highlighted. A monster lamb twinned to a normal lamb. Cesarean section, morphological examination and necropsy. At cesarean operation, a live male twin and a phenotypically male monster were delivered. The monster was diagnosed as Holoacardius acephalus.Presentation of a very rare monster case in the sheep was highlighted. A monster lamb twinned to a normal lamb. Cesarean section, morphological examination and necropsy. At cesarean operation, a live male twin and a phenotypically male monster were delivered. The monster was diagnosed as Holoacardius acephalus. Presentation of a very rare monster case in the sheep was highlighted. A monster lamb twinned to a normal lamb. Cesarean section, morphological examination and necropsy. At cesarean operation, a live male twin and a phenotypically male monster were delivered. The monster was diagnosed as Holoacardius acephalus. Presentation of a very rare monster case in the sheep was highlighted. A monster lamb twinned to a normal lamb. Cesarean section, morphological examination and necropsy. At cesarean operation, a live male twin and a phenotypically male monster were delivered. The monster was diagnosed as Holoacardius acephalus.