The Eye-Stalker Bulbeel is an enemy found in Hey! Pikmin. It is a large aquatic Grub-Dog creature that charge while expanding its massive mouth to swallow prey whole.
Eye-Stalker Bulbeels wait for its prey to pass overhead, after which they will open their large mouths and charge, attempting to swallow any Pikmin that might be in their path. If they miss their target, they will slowly retreat back into their alcoves and wait for their next opportunity to strike. If killed they will drop 15 Sparklium.
Hey! Pikmin log
"Apparently the Grub-dog family includes this aquatic relative, which will try to eat anything that draws near. I wonder how many times that's backfired on it. How many acorns that happened to fall near its mouth has it swallowed?"