Usually they withdraw into their shells and if you continue to touch them they will open their big pincher to let you know that they are prepared to fight if need be.
Some are not shy they are scared. Not of you just of being around a new place.
They arent squealing, they are chirping. This is how they communicate with one another. But if you only have one, it could just be chirping for fun :) Dont worry about, it is normal. :)
A lot
No, Hermit Crabs are omnivores.
fish and bigger hermit crabs
Yes hermit crabs have antennas.
No hermit crabs are small and friendly
sea birds, fish, octopuses, crabs, and other hermit crabs
it deppends on how big the hermit crabs and the moon crabs are but if the hermit crab is bigger youv'e got your self a dead moon crab
yes
Hermit crabs use meiosis to reproduce
no i had hermit crabs and had salt it didn't hurt them