Here's another Alien gargoyle:

This one is located on the Chapelle de Bethléem in France and apparently was also added during a 1990s restoration. This one looks to be based on the Alien Drone from Alien and is supposed to represent the "Leviathan". The same building also has gargoyles of the Gremlins and Gizmo.

Also notice that this one has eyes

More pictures of the Chapelle de Bethléem (in French)