the claws on a crab is called pinchers.
The males wave it over their heads to get the female's attenteion.While doing that it looks like their fiddling.Thats why there called fiddler crabs.
Chela
yes
by rubbing their big claw on there body
No.
they start to chase each other and then claw each other
red clawed crabs eat best when no one is around or watching them (at night).
It will drasticly reduce their life they are semi aquatic needing both dry lanf and water
Hermit crabs usually , if not always, have one large claw and one smaller claw.
In most cases yes, unless they lost their claw due to stress or sickness
They dip their big claw in the water and drink the drops on the claw, they do that over and over again until they are full.
No, Because if you do they lose a leg. But if you pick up a male they will lose a leg and a claw but the claw will grow back not the legs