Sarcastic fringeheads are aggressive and extremely territorial about the shells in which they make their homes, so they're prone to getting into fights with each other, as well as with just about anything that has the gall to drift into their area.
Fighting fringeheads look like two angry plungers going to war. Usually when animals fight, they do so by clawing and biting chunks off of each other, but while the jaws of the fringehead look downright terrifying, they seem to prevent any actual damage. A fringehead probably scores a definitive, bloody victory every once in a while, but at the end of this video, one seems to realize that the entire ordeal is laughably futile and swims away.
Watch the Predator movie, compare for yourself.
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