If you agro/kit a pracer to one it will kill the crab and you will get all the chitin that solved my Chitin/cementing past problem early on (they drop 300 Chiron) in aberation I am now taming a spino to get Chitin faster
Tranq Arrows/Darts DO NOT WORK!!! To knock this out you need to use a catapult and shoot in only on it's back. If you shoot it on it's legs it will kill it. UP-VOTE SO EVERYONE KNOWS & TO GET DODODEX TO ADD THIS!!!