No, by no means are green crabs (carcinus maenas) endangered. In some parts along the European coast, they're considered pests.
rats ate them
No
It largely depends on the species of crab you are talking about. There are some species which are already extinct and there are other species which you will see every time you go to any beach.
green crab or dogga crab
no
humans
CLAMS
if you go near the green crab don't bother them or they will snip you and won't let go and it will hurt you and only a person how has worked with crab can get it of and the crab can breack your finger bone if it wants to.
the crab will sooner or later die off DO NOT REMOVE THE HERMIT CRAB SHELL if a crab dies out of it dries out and its a slow death so for the sake of the crab DO NOT REMOVE THE CRAB SHELL
yes it does
It is a green hermit crab with blue claws.
no
It did for me! Weird.