THESE THINGS! it says passive but aggressive when approached? NO! these things are aggressive with an extra side of hatred and aggression on the side. they killed my level 40 karposuchus, and my fully black triceratops! (r.i.p snaps and dodge) i hate these things with a burning passion.

MAKE SURE YOUR WATER DINOS ARE ON PASSIVE OR THEY WILL RUN STRAIGHT TO THESE HOMEWRECKERS WHEN YOU GET OFF! ...ask me how I know

Lightning wyevern can eat these without getting shocked as long as you don't go to deep in to the water.

Only takes 2-3 arrows to kill. Use a crossbow and stay at a safe distance while shooting!

l lost my spino to some group of mantas rex to these cnidarias while i was crossing the same river... went to complete knowledge of the forbears with 2 very good tame and returned home with nothing thanks to these mfs

DONT SPAWN ON HERBIVORE ISLAND!!!!! HERB ISLAND IS SAFE HAVEN FOR PEOPLE WITH PTERA OR RAFT the world must know! Press good arrow to spread the word!

Basilisaurus and giant squid thingy are immune to this, this wicked creature

DON’T and I mean DON’T get near them with a dino dear to you cause AHAHAHA They’ll rip you of it if your riding it near there area and if your not on it it’ll probably murder them when they attack you,oh and did I mention? They’ll rip you back off if you try to get back on your mount and escape.

Don't even try hit them without range weapon. Or u can lure them to get closer on land, and hit them freely,But its really risky.

My first time playing ark I saw like five Cnidarias and jumped in the water to see what they were then they paralyzed me and killed me while I sat there helpless then when I tried to get my stuff back they just sat there guarding my stuff then I tried to get my stuff again and died😭😭😭

Easy just knock out ur friend A HeLpFuL tIp ShOuLd InClUdE a FeW mOrE wOrDs

If you decide to take your spino out for a swim, do not under any circumstances let them touch you. I got shocked and dismounted from my spino and I swam away to try and whistle him to me. I then had to watch in horror as my spino get shocked to death by 5 jellys and 3 megs. It was also my first spino. RIP Spiny

I’ve been playing Ark for only a couple months, but so far, these have killed me and my water mounts more than any land encounters. Why are these things aggressive? People say these are neutral but they really aren’t. They stun lock you til you die, and these kill your mounts. Super annoying and if you see one in the water, just don’t go in. Unless you have a Basilosaurus, I highly recommend staying away from these.

I have found that using a long-ranged weapon like a crossbow or slingshot on them from shore is an easy way to kill them, hope this helps!

These thing ARE THE WORST well not the worst raptors are but anyways these things will KILL AND DESTROY YOUR ANIMALS YOU CANT REVIVE THEM BECAUSE THEY EAT YOUR DINOS!

Lure them onto land. Once you do that, they can't attack you.

One of my favorite feelings in the world is the smug satisfaction of these idiots being unable to do anything to my basilo.

The only reason for jellyfish is to kill them. Execution order 66

Why is it classified as herbivores

Use the basilosaurus they are immune to the cnidaria stings.