Glaucus atlanticus - Wikipedia entry
Soyeun Choi stashed this in Science
A sea slug that is known by the name Blue Dragon?!
Someone has an overdeveloped sense of self-esteem. :)
G. atlanticus preys on other, larger pelagic organisms: the dangerously venomous Portuguese Man o' War Physalia physalis; the by-the-wind-sailor Velella velella; the blue button Porpita porpita; and the violet snail, Janthina janthina. Occasionally, individual Glaucus become cannibals given the opportunity.
Wait, did they say Violent Snail?!
Or ViolET snail. Although, the idea of a snarling snail is charming. (As long as it remains under 5 inches and is not poisonous. Ruuuuuuuuun awaaaaay!)
Why under 5 inches?
I think the largest banana slug I've seen was about five inches. Plus, if it's snarling, I think less is just fine.
In general it's a good idea to steer clear of snarling animals.