JK Brickworks’ LEGO creation are quite special. His latest one is a LEGO version of the Piranha Plant from Super Mario Brothers. Each side of the mouth is hinged and attached to a lift arm. The connector which moves to mouth is attached to a piston, which is driven by a crank at the base of the plant.
This video has more information on what it would take to build your own LEGO piranha plant.