Biology/Natural History: The spines on the legs may help this crab hang onto the kelp and avoid being swept off. This crab does not usually decorate itself much, but it does so occasionally. Predators include halibut, clingfish, kelpfish, and woolly sculpin. During mating, the male lies on its back and the female stands above, facing him. Ovigerous females have been found through most of the year in Puget Sound. Females have around 6200 to 13,000 eggs per brood. The long legs of this crab are especially agile, and they can reach far above and behind them for defense.