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

They can walk over spiked walls.

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

Has a slow reaction time and you can usually avoid it attacking you by running under its legs.This might change in later patches

They drop Organic Polymer when you harvest their corpse

They often spawn near the lake by the portal in aberration so if your looking for one be careful and don’t swim to deep!

They seem to have a bug where a Sarco just stands under them so the can’t attack them somehow. I lost 2 craps to a lvl 10 sarco because of that.....

Throwing a plant z grenade can cause a Karkinos to drop you or your dino. Essential when traveling on Ravenger back.

Be careful when attacking them since then can grab you off of most mounts (including your own crab)

Beware, usually found near spinosaurus and they don't attack each other.

Um just tell your dinosaurs to follow you and run if your an early player

Then I told the police he grabbed me...

It can grab a Carno. :( Also, Stegos.

Can’t pickup anything bigger than a stego

Tranq your mate and run for your life

Can be fought by 3 main options:
Having at least 3 decently strong creatures so while it picks up 2 the third one will fight.
Have a mount that it can't pick up fight against it.
Shoot at it metal arrows to counter it's damage resistance from most projectiles.

Drops organic polymer grabs you and smashes you on ground

Even though it's mainly a water dino, it can still pose a threat to you on land, so be careful!

can be found along with ravagers and other creatures on Valguero. northeast of map, look for underground waterfall.

If you see these guys in the wild the aren’t as difficult to kill with a ledge and few arrows to the legs you’ll be set.