User blog comment:Rex White/Sneak Peek For Stuff I'm Working On/@comment-5020152-20150811021220/@comment-4090136-20150812200435

Yeah, they're definitely scary (and also aggressive to humans and everything else). Fortunately, they are usually less than 10 inches long. Unless you're unlucky, because some can grow to 1 foot long. These ones are dangerous because they can cause serious injuries with a wet suit on. I don't dare to think what would happen without one. They are also not endangered because their appearance wards off predators. Specifically, in one place there is a lot of trash which thousands of Sarcastic Fringeheads live in.

Another interesting thing is how they look when their mouth flaps aren't opened.