prey and display a stereotypical sequence of color changes at the moment of capture. Following the capture of bivalve prey, it will often drill a hole through the shell to deliver venom and more easily open the shell. The octopuses will often concentrate their drill holes near the adductor muscles of the bivalve prey. A recent study has suggested O. rubescens may choose prey based on fat digestibility rather than on the amount of calories the octopuses is able to obtain from the food items. If this is true, the authors further argue, this would make O. rubescens a specialist predator by some measures, rather than a generalist, due to it specific nutrient requirements. Other behavior O. rubescens was the first invertebrate in which individual personalities were demonstrated. References External links Walla Walla University Marine Invertebrate Key Octopuses Molluscs of the Pacific Ocean Marine molluscs of North America Western North American coastal fauna Marine fauna of the Gulf of California Fauna of California Molluscs described in 1953 Taxa named by Samuel Stillman Berry