Rock Lobster

Rock Lobsters are neutral creatures found in Caves. They eat Rocks and rock-related item like Flint and Gold Nuggets, all of which can be given to them as food. They grow over time, slowly regenerate their health, and come in a variety of rocky colors. Rock Lobsters do not spawn until Day 4. When killed they shatter and drop Meat, Rocks, and Flint.You can find them in big, muddy areas with some Boulders.

Behaviour
Rock Lobsters are slow-moving and live in herds. They roam around looking for Rocks and Flint to eat, only fighting when they are attacked. When attacked, Rock Lobsters hide by camouflaging themselves as large stones. While hiding their stone-shells absorb 95% of damage. Like Pigs, Rock Lobsters can be convinced to follow and fight for the character when given food, however they only follow for about 3 minutes.

Hunting
Rock Lobsters have high health, and protect themselves from damage. They also live in herds and will defend each other when necessary. Additionally, their health slowly regenerates. All of this taken together means that Rock Lobsters are very difficult to kill. When possible, it's a good idea to seperate one from the group before fighting it, or use ranged weapons as they are slow-moving which allows for multiple hits in a short time.

Trivia

 * Rock lobster is probably an idea from the B-52's song "Rock Lobster".