New mod idea: Stalker Crab

Crab looking mob Green/blue color scheme Spawns on beaches, rivers, deserts, and underwater. Burrows in the ground and will come to surface if you step on a block where one is burrowing. Will be hostile if attacked, will burrow in ground and rise up and pinch you with its claws. Smaller mob, bigger than a silverfish but smaller than chicken. Will live peacefully along other aquatic mobs, other than cod and salmon which it will attack. Breeds with cod/salmon. Can be collected in bucket. Will team up with other stalker crabs to attack mobs, occasionally going up against squids and glow squids (or a drowned if one strikes) but only if there are 3+ in a group. Attacked by drowned, but not all the time they will live peacefully but if a drowned steps on a burrowing block the crab will rise up and pinch the drowned. Drops 2 XP but are not meant to be killed. Will leave player alone after pinching the players, unless the player strikes back then it will continue attacking. Will burrow on sand and gravel, there would be a slight texture change to show that one is burrowing, other mobs tend to avoid burrowing blocks but may step on it. Can not be tamed but will work with you.