They cover their snouts with sponges to protect them while foraging. By 2020, ecologists had estimated that no more than 18 adults remained. , Juvenile dolphins off the coast of Western Australia have been observed chasing, capturing, and chewing on blowfish. , Today, the closest living relatives of cetaceans are the hippopotamuses; these share a semi-aquatic ancestor that branched off from other artiodactyls some 60 million years ago.  Dolphin meat is high in mercury and may thus pose a health danger to humans when consumed.
The most common dolphin species in captivity is the bottlenose dolphin, while there are around 60 captive killer whales.
 Playful behaviour that involves another animal species with active participation of the other animal can also be observed however. Some species are limited or decreasing in certain areas, for example, the population of the narrow-ridged finless porpoise in the Yangtze River is about 1,000 and decreasing. Updates?
A well-known historical example of a dolphin in heraldry, was the arms for the former province of the Dauphiné in southern France, from which were derived the arms and the title of the Dauphin of France, the heir to the former throne of France (the title literally means "The Dolphin of France"). Dolphins are social mammals that interact with one another, swim together, protect each other, and hunt for food as a team.
, Dolphins show various types of playful behavior, often including objects, self-made bubble rings, other dolphins or other animals. The term dolphin usually refers to the extant families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), and Pontoporiidae (the brackish dolphins), and the extinct Lipotidae (baiji or Chinese river dolphin).
 Cetacean spindle neurons are found in areas of the brain that are homologous to where they are found in humans, suggesting that they perform a similar function. Dolphin Saves Stuck Whales, Guides Them Back to Sea.  A study at the U.S. National Marine Mammal Foundation revealed that dolphins, like humans, develop a natural form of type 2 diabetes which may lead to a better understanding of the disease and new treatments for both humans and dolphins. India has declared the dolphin as its national aquatic animal in an attempt to protect the endangered Ganges river dolphin. The collective noun for porpoises is the word you would use to describe a group of porpoises. A porpoise has a rounded head and a triangular-shaped dorsal fin. A porpoise is a mammal that lives in coastal waters including rivers, bays, and estuaries. Omissions? , Dolphins have a two-chambered stomach that is similar in structure to terrestrial carnivores. , Various species of dolphins are kept in captivity. Playful human interaction with dolphins being the most obvious example, however playful interactions have been observed in the wild with a number of other species as well, such as humpback whales and dogs. Dolphins are capable of making a broad range of sounds using nasal airsacs located just below the blowhole. Why don't libraries smell like bookstores?  Other dolphin hybrids live in captivity around the world or have been reported in the wild, such as a bottlenose-Atlantic spotted hybrid. What is a group of porpoise called?
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