Skyrim's mudcrab's are vastly superior to any other mudcrab, I've seen them whoop some ass. For instance I seriouisly watched two Gargoyles attacking a Mudcrab and the Mudcrab won!
Also seen them kill wolves and bandits as well. They are odd critters but I have come to adore them greatly! I hope one of my characters kids brings home a mudcrab as a pet i'd be very happy then.
Yes I think it was the angles, the Gargoyles could not hit the Mudcrab so it just chipped away the gargoyles health till it killed them, but really them crabs be badasses.
One of my characters daughter brought home a snow fox vixen pup, another of my characters son brought home a skeever.