The Red Rock Crab, Cancer productus, is notable for its vibrant reddish-purple shell and large, robust claws. It inhabits rocky shorelines from Alaska to Baja California, often hiding under rocks or in crevices. This species is an opportunistic scavenger, playing a crucial role in the coastal ecosystem by cleaning up decaying matter.

Cancer productus, commonly known as the Red Rock Crab, is native to the Pacific coast of North America. Its geographical distribution extends from the coast of Alaska, through British Columbia, Washington, Oregon, and down to Baja California in Mexico.

The Red Rock Crab typically inhabits rocky intertidal and subtidal zones, where it can be found at depths ranging from the low intertidal zone to about 90 meters. The species thrives in environments with rocky substrates as these provide ample hiding spots and protection from predators. It is well adapted to the varying salinity levels found in estuarine environments and often coexists with kelp forests and eelgrass beds.

Cancer productus plays a significant role as both a predator and scavenger within its ecosystem. It primarily feeds on smaller invertebrates, including snails, clams, and other crustaceans, and is known for its strong claws capable of cracking hard shells. The species contributes to the regulation of prey populations and serves as a food source for larger marine animals, including fish and birds. Its ability to thrive in different intertidal and subtidal zones demonstrates its ecological versatility and importance in coastal marine ecosystems.