By numbers, dolphins are mostly hunted for their meat, though some end up in dolphinariums. , A number of militaries have employed dolphins for various purposes from finding mines to rescuing lost or trapped humans. Porpoises tend to travel in very small groups, according to Diffen.com, which analyzes some of the differences between dolphins and porpoises.
Porpoises are somewhat invisible. , The olfactory lobes are absent in dolphins, suggesting that they have no sense of smell. Captives have vastly reduced life expectancies, on average only living into their 20s, although there are examples of killer whales living longer, including several over 30 years old, and two captive orcas, Corky II and Lolita, are in their mid-40s. Using sponges as mouth protection is a learned behavior. See cetacean intelligence for more details. Comparing species' relative intelligence is complicated by differences in sensory apparatus, response modes, and nature of cognition. The healing process is rapid and even very deep wounds do not cause dolphins to hemorrhage to death. Pod life plays a very important role in protecting dolphins from predators such as sharks.  Tilikum's behaviour sparked the production of the documentary Blackfish, which focuses on the consequences of keeping orcas in captivity. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. , Queensland's shark culling program, which has killed roughly 50,000 sharks since 1962, has also killed thousands of dolphins as bycatch. The clicks are directional and are for echolocation, often occurring in a short series called a click train. The calf may stay with her from three to six years as it learns how to become a strong swimmer and survive on its own. A group of porpoises is referred to as a pod. In humans, the middle ear works as an impedance equalizer between the outside air's low impedance and the cochlear fluid's high impedance.  "Shark control" programs in both Queensland and New South Wales use shark nets and drum lines, which entangle and kill dolphins. , Archaeoceti is a parvorder comprising ancient whales. Porpoise, (family Phocoenidae), specifically, any of seven species of toothed whales distinguishable from dolphins by their more compact build, generally smaller size (maximum length about 2 metres, or 6.6 feet), and curved blunt snout with spatulate rather than conical teeth. In captivity, dolphins seemingly enter a fully asleep state where both eyes are closed and there is no response to mild external stimuli. They have streamlined bodies and two limbs that are modified into flippers. How long will the footprints on the moon last? Signal masking is when other similar sounds (conspecific sounds) interfere with the original acoustic sound. Whistle repertoire analysis of the short beaked Common Dolphin, "Dynamics of Dolphin Porpoising Revisited", "Bubble Ring Play of Bottlenose Dolphins (, Amazing footage of a dog playing with a dolphin off the coast of Ireland, "Apparently Dolphins in Australia Like to Get Stoned by Chewing on Toxic Blowfish", "Do Stoned Dolphins Give 'Puff Puff Pass' A Whole New Meaning? • They are carnivores that eat mostly fish and crustaceans. How long will the footprints on the moon last? Facilities such as SeaWorld and the Georgia Aquarium are accredited by the AZA. The dorsal fin on the back of a porpoise looks like a triangle while the tip of a dolphin’s dorsal fin hooks backward.  Captives occasionally act aggressively towards themselves, their tankmates, or humans, which critics say is a result of stress.  Dolphins use their conical shaped teeth to capture fast moving prey. Mukhametov", Photographer Captures Stunning Killer Whale Attack on Dolphin, "Emerging diseases in marine mammals: from dolphins to manatees". , Dolphins have a two-chambered stomach that is similar in structure to terrestrial carnivores. In places with a high abundance of food, pods can merge temporarily, forming a superpod; such groupings may exceed 1,000 dolphins. Porpoises migrate to different parts of coastal regions. 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