Long-beaked common dolphin
The Long-beaked common dolphin (Delphinus capensis) is a species of common dolphin. It has a more restricted range than the Short-beaked common dolphin (D. delphis). It has a disjointed range in coastal areas in tropical and warmer temperate oceans. The range includes parts of western and southern Africa, much of western South America, central California to central Mexico, coastal Peru, areas around Japan, Korea and Taiwan, and possibly near Oman. Vagrants have been recorded as far north as Vancouver Island. They prefer to live in shallow, warmer temperature waters near the coast. They also live in the tropical and subtropical regions. 
The Long-beaked common dolphin is a medium sized dolphin, smaller than the more popular bottlenose dolphin. Adults range between 1.9 and 2.5 metres (6.2 and 8.2 ft), long, and can weigh between 80 and 235 kilograms (180 and 520 lb), although a range between 80 and 150 kilograms (180 and 330 lb) is more common. Males are generally longer and heavier. The color pattern on the body is unusual. The back is dark and the belly is white, while on each side is an hourglass pattern colored light grey, yellow or gold in front and dirty grey in back. This species also has a rounded melon on top of their head used for echolocation.  It has a long, thin rostrum with up to 50–60 small, sharp, interlocking teeth on each side of each jaw. They have more teeth than any other types of delphinids. 
The Long-beaked common dolphin is a member of common dolphin genus, Delphinus within the dolphin family, Delphinidae. It is also part of the cetaceans order.  Until the mid-1990s, the different forms within Delphinus were not recognized as separate species, but were all considered members of the species D. delphis. In 1994, Heyning and Perrin did research on these species and then Kingston and Rosel comfirmed that there were two separate species. Currently, there are two recognized species of Delphinus — the Short-beaked common dolphin (D. delphis) and the Long-beaked common dolphin. The Long-beaked common dolphin is generally larger with a longer beak than the Short-beaked common dolphin and has a longer rostrum.
Long-beaked common dolphins can live in aggregations of hundreds or even thousands of dolphins. Within these large groups there are typically smaller sub-groups of 10 to 30 that are related in either sex or age. They sometimes associate with other dolphin species, such as pilot whales. They have also been observed bow riding on baleen whales, and they also bow ride on boats. Breaching behavior and aerial acrobatics are common with this species.
The Long-beaked common dolphin has a varied diet that can consist of small schooling fish such as sardines, anchovies, or pilchards and also krill and cephalopods. This species may work in groups to herd their prey together.  They are able to dive in the water to about 900 ft (280 m) and hold their breath for up to 8 minutes to catch prey.
The Long-beaked common dolphin has a gestation period of 10 to 11 months typically during spring or autumn. The newborn calf has a length of between 80 and 100 centimetres (2.6 and 3.3 ft) and a weight of about 10 kilograms (22 lb). The young and juvenile dolphins coloration and patterns are darker than the adults. Typical interbirth interval ranges from 1 to 3 years. In captivity, the Long-beaked common dolphin has hybridized with the Common bottlenose dolphin (Tursiops truncatus). One of the hybrids has been bred back to a bottlenose dolphin, demonstrating that such hybrids are fertile. The Long-Beaked Common Dolphin can live up to 40 years. 
The Long-beaked common dolphin is covered by the Memorandum of Understanding Concerning the Conservation of the Manatee and Small Cetaceans of Western Africa and Macaronesia and the Memorandum of Understanding for the Conservation of Cetaceans and Their Habitats in the Pacific Islands Region (Pacific Cetaceans MoU). One of the main threats to the Long-Beaked Common Dolphin is fisheries. Out of 930 dolphins observed off of Peru between 1985 and 2000, 120 of them had many lacerations on their head, skin, appendages, and teeth. Most of these injuries were from fisheries-related connection.  Another threat to this species is pollution because many of them have shown signs of organochlorine residue on their blubber.  On the coast of California there are only about 25,000 to 43,000 dolphins and on the caost of South Africa there are 15,000 to 20,000. 
- Mead, J. G.; Brownell, R. L., Jr. (2005). "Order Cetacea". In Wilson, D. E.; Reeder, D. M. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. pp. 723–743. ISBN 978-0-8018-8221-0. OCLC 62265494.
- Hammond, P.S., Bearzi, G., Bjørge, A., Forney, K., Karczmarski, L., Kasuya, T., Perrin, W.F., Scott, M.D., Wang, J.Y., Wells, R.S. & Wilson, B. (2008). Delphinus capensis. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 7 October 2008.
- Perrin, W. (2002). "Common Dolphins". In Perrin, W.; Wursig, B. and Thewissen, J. Encyclopedia of Marine Mammals. Academic Press. pp. 245–248. ISBN 0-12-551340-2.
- Mark McGinley, Eileen Mary Dee (December 2011). "Long-beaked common dolphin". Encyclopedia of earth. Retrieved April 2013.
- Shirihai, H. & Jarrett, B. (2006). Whales, Dolphins and Other Marine Mammals of the World. pp. 174–176. ISBN 0-691-12757-3.
- Reeves, Stewart, Clapham, Powell. Guide to Marine Mammals of the World. p. 388. ISBN 0-375-41141-0.
- "The Common Dolphin". Retrieved 2008-07-03.
- Jefferson TA, Webber MA , Pitman RL (2008) Marine mammals of the world. Elsevier, Amsterdam, 573 pp.
- Heyning JE, Perrin W F (1994) Evidence for two species of common dolphins (genus Delphinus) from the eastern North Pacific. Los Angeles County Mus. Nat. Hist. Contr. Sci. 442: 1-35.
- Kingston SE, Rosel PE (2004) Genetic differentiation among recently diverged delphinid taxa determined using AFLP markers. J. Hered. 95: 1-10
- "Long-Beaked Common Dolphin (Delphinus capensis)". NOAA Fisheries, Office of Protected Resources. 2012. Retrieved April 2013.
- Zornetzer H.R.; Duffield D.A. (October 1, 2003). "Captive-born bottlenose dolphin × common dolphin (Tursiops truncatus × Delphinus capensis) intergeneric hybrids". Canadian Journal of Zoology (NRC Research Press) 81 (10): 1755–1762. doi:10.1139/z03-150.
- Memorandum of Understanding Concerning the Conservation of the Manatee and Small Cetaceans of Western Africa and Macaronesia
- Memorandum of Understanding for the Conservation of Cetaceans and Their Habitats in the Pacific Islands Region
- Van Bressem M-F, Van Waerebeek K, Montes D, Kennedy S, Reyes JC, Garcia-Godos IA, Onton-Silva K, Alfaro-Shigueto Joanna (2006) Diseases, lesions and malformations in the long-beaked common dolphin Delphinus capensis from the Southeast Pacific. Dis. Aquat. Org. 68: 149-165
- Kajiwara N, Matsuoka S, Iwata H, Tanabe S, Rosas FCW, Fillmann G, Readman JW(2004) Contamination by persistent organochlorines in cetaceans incidentally caught along Brazilian coastal waters. Arch. Environ. Contam. Toxicol. 46: 124-134
- Shirihai, H. and B. Jarrett (2006). Whales, Dolphins and Other Marine Mammals of the World. Princeton, Princeton University Press. p. 174-176.