Giant Pacific octopus (Octopus dofleini)

One of the largest known octopi, growing to 100 pounds with an arm spread of nearly 10 feet. (The largest recorded was nearly 600 pounds.) Ranging from Alaska to California, it inhabits rocky shores, tide pools, and water at depths up to 1600 feet. Feeds primarily on crabs, but will also eat shrimps, scallops abalone, clams, fish and smaller octopi and is eaten by seals, sharks and larger fishes.

Gumboot (Giant Pacific) chiton (Cryptochiton stelleri)

Grows to 13 inches and is found on rocks from low-tide level to depths of 60 feet feeding on algae. Unlike most chitons, it doesn't grip tightly on surfaces and is often found detached. When handled, it rolls slowly into a ball like an armadillo for protection.