These are the cetaceans (whales, dolphins and porpoises). Dolphins and porpoises are more likely to be infected than cetaceans such as whales. Humpbacks are a friendly species that interact with other cetaceans such as bottlenose dolphins. Porpoises are small cetaceans of the family Phocoenidae. Similar to modern cetaceans, such as whales and dolphins, ichthyosaurs were air-breathing. Drinking is not common behavior in pinnipeds and cetaceans. This may apply to the other species of cetaceans, such as sperm whales. Much of the findings that apply to all cetaceans were first discovered in porpoises. Coastal waters are also utilized for small-type coastal whaling of dolphins and other small cetaceans. Non-vocal communication is not as common in pinnipeds as in cetaceans. They are found in humans, bonobos, chimpanzees, gorillas, orangutans, some cetaceans, and elephants. Belugas are among the most vocal cetaceans. The evolution of encephalization in cetaceans is similar to that in primates. Elephant intelligence has been compared with that of primates and cetaceans. The sperm whale is among the most sexually dimorphic of all cetaceans.