Wanaan

The Wanaan is an antlion-like robot found in Hard Man's stage and Dr. Wily Stage 2 in Mega Man 3. It hides out in pipes and if Mega Man stands on a Wanaan Pipe for too long, it will leap out with a SNAP! In Mega Man 8 and Mega Man and Bass, they have mobile holes and can be destroyed with weapons that fire lo to the ground.