Is it normal people would eat such an animal?
Lobster and krab have got to have some of the best build systems in the world. They are amazingly difficult to kill. Even if you chop off its arm it is and parts of its head it will still move. The shell is very hard and if you ever looked at one up close will notice they have spikes on its shell. It is very difficult to break. The only way to kill it is boil it alive or cut it in the back of the neck. Clearly this a very well designed creature. Krabs are even harder to kill and has similar issues. This must be one of the most difficult things to kill.