I was floating above water in Crystal isles. I was close enough that if it jumped it could touch me but it didn’t attack me. I think they can only attack in water.

On ragnarok there is a secret under water cave with karkinkos high levels I tamed a level 190

It's a Giant crab that can throw it's enemies far away

I’d say I’m having pretty bad day. So, I just bought Abberation and I was so excited, so I went over to the water. I don’t know much about Abberation, so I thought the Karkinos was just a kind little crab. Oh boy was I wrong.. I went closer to the water, as I was thirsty. But the Karkinos comes running up to me, picks me up and shreds me to pieces. Let’s just say I took a little break from Abberation 1 minute after I bought it.

They spawn in Genesis in several caves in the Lunar biome

Make sure to carry around grappling hooks

If picked you can graple the crab and it will let go

Karkinos do NOT spawn on Ark Ultimate Mobile Edition Ragnarok map. They only spawn on Mobile Aberration.

In the wild crabs and spinos are buddies... they use the buddy system...

They can walk over spiked walls.