Gray Whales are a medium sized whale that live in the Pacific Ocean, the Bering Sea and the Chuchki Sea is where they feed on the nutrient rich waters off Alaskas. They make a migration from the Bering Sea to the lagoons in Baja to mate and calf and then back up to Alaska annually. They have a grayish skin from the barnacles that attach to the whales skin, and the yellowing are actually whale lice. Grays are bottom feeders, they feed on crab-like creatures known as amphipods. They are a baleen whale as well. They have many obstacles on their journey, Orcas wait along the coast, waiting for the moms to bring their calfs back up the coast, they try to feed on these babies. As well as passing by numerous harbors on the journey back up where there is a lot of boat traffic. There are gray whale census' all along the coastlines as they migrate back to Alaska, where they keep track of the number of whales each year.