So they don't drift apart. And that's not even the weird part.
The pocket. Built-in loose skin under the armpit. It stores a favourite rock. Some keep the same one for years.
The tool. The belly becomes an anvil. The rock cracks shellfish. A good rock is worth keeping.
Why the hands. They form floating rafts. Holding paws stops the group drifting apart while they sleep.
The delight. Nature built sharks, venom, claws — and also an animal whose survival strategy is: hold hands, keep a favourite rock, nap.