Whales, Dolphins, and Porpoises: A Natural History and Species Guide, Berta
7 Reasons Killer Whales Are Evil Geniuses - The Atlantic
Whales vs Dolphins - American Oceans
Northern Right Whale Dolphin
Dolphins and Whales Will Never Evolve Back into Land Animals - Scientific American
14 Most Endangered Whales, Porpoises, and Dolphins
Whale Goes Native in the Dolphin Pool – National Geographic Education Blog
11 Cool Facts About Whales, Dolphins, and Porpoises
Tropical Dolphins Are Appearing In Pacific Northwest Waters - OPB
Is an orca (killer whale) a whale or a dolphin? - Whale & Dolphin Conservation USA