Gray whales migrate from Baja California to Alaska--10,000 miles. It is the longest mammal migration in the world. They carry barnacles on their skin which gives them a speckled appearance. These barnacles do not harm the whale. They are bottom feeders and stay relatively close to shore. They are among the easiest whales to spot from the beach. If you follow the link above, the website has a recording of the conga drum like sounds gray whales make.