Mudcrabs are large crabs found near almost any body of water and even sewers in the Elder Scrolls series. The species seems to evolve differently depending on its surroundings. They are tough and territorial, and groups of mudcrabs may become troublesome. Individually, they are more of a nuisance than an actual danger. They usually disguise themselves causing wanderers to mistake them for rocks. Mudcrabs are usually detected by their loud legs scuttling across the ground. Mudcrabs are particularly known for their weakness and ugly appearance. While unremarkable in most provinces, the creature has gained a large fascination in Cyrodiil near the end of the Third Era. It's a very common pastime for Cyrodiillic people to express their dislike for the appearance of a Mudcrab to each other. Occasionally, when Cyrodillians are in battle, they throw the taunt, "I've fought mudcrabs more fearsome than you!" at their opponent. This could be taken as a very serious insult, as mudcrabs are terrible fighters. It is not known if Cyrodiil retained this fascination in the year 4E 201, in which the events of The Elder Scrolls V: Skyrim take place.

Morrowind Mudcrabs
This species of mudcrab resemble large, brown stones. They use this disguise to both avoid predators and fool prey before attacking with their powerful jaws and pincers, which can inflict swamp fever upon victims.
The Redoran Manor District and Council halls in Ald'ruhn are located in a massive shell that once belonged to a mudcrab of incredible size. This type does not posses the ability to camouflage itself as a rock. It's also much more crablike in appearance compared to its Morrowind cousin, in that it has pincer arms instead of jaws. Its back is covered by rock-like bulbs. It can infect its victims with swamp sever.

Skyrim mudcrabs
Skyrim mudcrabs look like crabs, like their Cyrodiillic cousins, but are also capable