It is speculated that crabs will attack players, but it is not clear the extent of damage they will be able to cause. Best to air on the side of caustion around these guys to start with!
Do make sure to check out the awesome video the CEO of Hypixel (Simon) posted on Twitter showing us a sneak peek of crabs!
Where to Find Crabs
A crab can be found at the bottom of the oceans and on the sand near the ocean.
Underwater Creature Family
The Crab is part of the Underwater Creature family. The underwater creature's family encompasses any mob that lives in or around water. It comprises of creatures living in rivers, living on the ocean shelf, and mobs in the depths of the deep ocean. The underwater creatures include all species of fish in Hytale, as well as many others.