Gargoyles are essentially elaborate, stylized rain gutters. Their mouths provide a spout that lets water drain from the roofs of churches and temples where they typically reside -- which begs the question of why a place of worship would want such eerie statues to adorn its walls.
In addition to their functional purpose, gargoyles in Medieval times were thought to ward off evil and to serve as a frightening visual incentive for people to obey church teaching. Over time they became more ornamental but largely continued the 'grotesque' aesthetic most associate with gargoyles.
http://www.huffingtonpost.com/2014/05/17...15933.html
In addition to their functional purpose, gargoyles in Medieval times were thought to ward off evil and to serve as a frightening visual incentive for people to obey church teaching. Over time they became more ornamental but largely continued the 'grotesque' aesthetic most associate with gargoyles.
http://www.huffingtonpost.com/2014/05/17...15933.html