Scylla(Hydrocanis raptamarina.) is an aquatic man-eater which drowns its prey. With its many dog-like heads on necks 30 to 50 feet long it has a dangerously long reach, so lingering near is not recommended. Its body length remains unknown. Odysseus fought one which dwelled in the Straits of Messina, a battle which was surveyed in Mythology. One of these creatures destroyed The Nautilus in Oceanology.