From sea lions to killer whales (and even polar bearsthere’s a fantastic variety of marine mammals living throughout Earth’s oceans. At Live Science, we direct you through the undersea worlds of our marine loved ones with the current news, functions and posts, so whether our professional authors and editors are describing why deep-diving mammals do not black out or reporting on a gray whale breaking the mammal migration recordyou’ll constantly have fascinating marine mammal truths to check out.