because they feel like it
Crabs do get afraid, especially of predators that will harm and eat them. Crabs that feel in danger will use their pincers to fight back.
No hermit crabs do not grow back skin
Crabs grow out of their shells and they also shed their skin to do that. Meaning they molt their skin.
No, they shed their shells regularily. that is where we get soft shell crabs from; crabs who have just shed their shells and are cooked. Like a snake shedding their skin.
They have skin, so they feel like us
Crabs pinch as a self defense mechanism. Crabs pinch when they're scared of falling like when you're holding them improperly. They also pinch if they feel threatened.
No they need to eat food that are bright colors like tomatoes, mangoes, and kiwies.
if untreated what problums can crabs do to human body
yes crabs are echinoderms because they have spiny skin
Untreated shock would make the skin feel cold and clammy.
Unless it's organic, yes, peel the skin. Hermit crabs are arthropods, just like insects. The insecticides they spray on the commercial crops will likely have negative affects on hermit crabs if they com in contact with them on the skin of the vegetable.