Whales are some of the most astounding creatures on Earth. Featuring the giant blue whale, toothy sperm whale, and fascinating Arctic narwhal, young marine biologists journey across the world’s great oceans in search of these magnificent mammals. But far more than just a whale book, Good Night Sea Mammals features a host of other creatures including seals, sea lions, manatees, sea otters, dolphins, walruses, orca, beluga whales, and polar bears.