According to Dr. Bhagavan Antle, the Head Size of Hercules the liger is equal to the Shoulders of a man. Normally the shoulders of a man are around 18 feet. Therefore; the head of the Hercules the liger will be around 20 feet. Please not this is not a diameter measurement regarding the head size of Hercules the liger. For further information please visit our website www.ligerworld.com www.liger-hercules.com