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I am a wildlife biologist working for the State of Washington.
Chehalis, WashingtonSign In to follow
The fisher is a candidate for listing under the Endangered Species Act. In the state of Washington, fishers have been re-introduced to the Olympic Peninsula, and I believe they will be (or have been) re-introduced to the Mt. Rainier area.
Based on the habitat (rocky intertidal) it is probably a striped shore crab. Purple shore crabs also occur in this habitat, but they tend to have distinctive red spots on the claws. Can't quite make out the carapace to be sure.
According to californiaherps.com, there are two subspecies of western rattlesnake in northern California: the northern Pacific, and the Great Basin, which occurs generally east of the Cascades-Sierra Nevada.