From VanTiki:

"Giant Crab Claw Mug by VanTiki the last of the 'Red Crab' edition of 20 mugs! A Curious Fact about The Giant Red Crab: An herbivore by nature, The Giant Red Crab is particularly feared by sailors. The lumbering crustaceans have developed a very specialized diet consisting entirely of limes pried from the holds of sailing ships they drag beneath the waves. Perhaps scurvy isn't so bad after all. 8.25" tall, holds approx. 400ml (13.5 fl oz)."

There was also a blue edition of this design.