Rock Crabs are a monster found in the Fremennik Province. They are unique due to their method of disguising themselves as a rock, and will only reveal themselves to be rock crabs if a player approaches within 1 tile of their disguised form. They will become aggressive and attackable to players who approach them. Rock crabs have a distinctive rock shape and texture that makes them noticeable from the environment from non-interactable rocks, and are often found in small clusters that makes other rock crabs quickly shift out of their disguise form upon respawn in order to attack players. This makes rock crabs a suitable combat training method for low to medium-levelled players, though rock crabs will still experience tolerance, so players who wish to train combat on rock crabs may need to leave and re-enter the area after some time.
In the quest Fur 'n Seek, a carcass must be collected and cleaned for the Odd Old Man.
Rock Crabs used to be commonly trained upon due to their high exp rewards; and occasional valuable drops, low combat level and defence. Most places where Rock Crabs reside used to be heavily crowded. After the Evolution of Combat update, Rock Crabs became level 102, making low-level training very difficult. After the Legacy Combat update, their combat level was altered to 71.
The Rellekka coast, home to many rock crabs
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- Universal drops are dropped by nearly every monster outside of Daemonheim.
- These items are dropped alongside main drops.
These animals are most likely, as the name suggests, a form of crab, noting that the rock crabs always walk sideways (and attack by smashing their sides into the player). It is possible that they may belong to a different animal phylum, such as insects, and only look like crabs, although this is not very likely. The animals are always spotted near water; while the graphics of RuneScape do not show them immersing themselves in water, it can be safely assumed that they would hypothetically do so. In the quest Fur 'n Seek, the rock crab's carcass that is collected by the player consists of only a shell and other, not easily visible remnants.
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- The examine for rock crabs is: "No-one likes crabs..." This could be a reference to grumpy people, as they are sometimes called "crabs".
- The Fremennik used to eat them, as mentioned in the lore Twice Burnt, although players cannot cook them.
- If a rock crab is killed in a small ditch a glitch will happen where the drop will be floating.