Marine dolphin family Delphinidae Cetacea. Marine mammals related to whales and dolphins. They are found throughout the world, especially in the shallow water of the continental shelf. As the name suggests, these dolphins tend to be found in the open ocean, not like the river dolphin, although some species such as the Irrawaddy dolphins that beach or river.
Six of the larger species in the Delphinidae, the Orca and Pilot (long-finned and short-finned), Melon-headed, Pygmy Killer and Pope, commonly called whales, dolphins are not, they are also sometimes collectively known as "blackfish".
The Delphinidae most diverse cetacean family, with many variations among species. They range in size from 1.2 meters (3.9 feet) and 40 kilograms (88 pounds) (Haviside's dolphin), up to 9 meters (30 ft) and 10 tonnes (Orca). Most of the species has a weight between about 50 and 200 kilograms (110 and 440 lb). They usually have a curved dorsal fin, a 'half' clearly on the front of the head, forehead melons, though there are exceptions to all rules. They have a wide range of colors and patterns.
Delphinids Most especially eating fish, along with a small amount of squid and small crustaceans, but a few species specialize in eating squid, or, in the case of Orca, also eat marine mammals. All, however, are pure carnivores. They usually have between 100 and 200 teeth, although some species have much less.
Delphinids travel in large pods, which might number a thousand people in several species. Each pod emerald span of several dozen to several hundred square miles. Some pods have a loose social structure, with individuals often join or leave, but others seem to be more permanent, perhaps dominated by men and 'harem' girls. Individuals communicate by voice, whistles produce low frequency, and also produce high-frequency broadband clicks from 80-220 kHz, which is mainly used for echolocation. Pregnancy lasts 10-12 months, and results in the birth of a single calf.
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