Certains groupes ou rassemblements peuvent compter d'une dizaine à plus d'une centaine d'individus. Les deux grandes sous-familles auraient divergé il y a environ 8 millions d'années (Miocène supérieur). A separate crescent-shaped flank patch reaches the top of the tail stock just in front of the flukes. Dusky dolphins were the subject of one of the first ever photo-identification studies, carried out off of Patagonia, Argentina in the 1970s. La langue est plate et presque collée au plancher buccal. This is because their lively acrobatic behaviour is very exciting to watch. Recognising individuals is the key to understanding the complicated social behaviour and detailed lives of dolphins. Dusky dolphins live in patches across the southern hemisphere in cool coastal and temperate waters. In-tracytoplasmic poxviruses were demonstrated by transmission electron microscopy in ultrathin sections of three of eight samples of infected epidermis from both species.

Orcas and some sharks prey on dusky dolphins. On a notamment enregistré des attaques de marsouins par des dauphins dans les eaux irlandaises. The Animal Diversity Web team is excited to announce ADW Pocket Guides!

It is common for dusky dolphins to swim according to cold water currents, and they are said to be able travel up to 780 kilometres (485 miles) in a single journey. Sorry, there are no literature references available for this species. La mâchoire joue aussi un rôle essentiel dans l'ouïe et l'écholocation, transmettant à l'oreille moyenne les vibrations reçues. Females are able to start getting pregnant between the age of 4.3 and 6.3 years and each pregnancy lasts 12.9 months. Overall, group sizes range from two to over one-thousand. Gray first described the species as Delphinus obscurus, with the subgenus Grampus in his 1828 Specilegia Zoologica.

The conspicuous dorsal fin is moderately falcate and pointed. La maturité sexuelle se situe souvent aux environs des 5 ou 6 ans. The Dusky Dolphin, Lagenorhynchus obscurus, is found near Australia and New Zealand as well as South America. Lagenorhynchus obscurus: information (1) ADW Pocket Guides on the iOS App Store! Species Lagenorhynchus obscurus dusky dolphin. The threats facing dusky dolphins are most severe in western South America with the IUCN listing this subspecies as Vulnerable. Certains Delphinidae peuvent vivre plus de 90 ans, comme l'orque en milieu sauvage[1]. The tail flukes have pointy ends and are dark all over. They are very social, fast-swimming and agile; they are always on the go. Dusky dolphins are often spotted with other dolphin species and feeding amongst seabirds. Les noms vernaculaires indiqués ci-dessous sont les noms le plus souvent utilisés mais il existe cependant de nombreuses variations. Classification Classification. Your gifts help us take action to protect their homes. Pacific white-sided dolphins usually tend to be larger than dusky dolphins. La respiration est volontaire. Accessed at https://animaldiversity.org. These dolphins are sold for food, so they are taken incidentally and as deliberate targets. They live off New Zealand, South America, southwestern Africa and around some oceanic island groups. L'évent, narine unique, est situé au sommet de la face crânienne, juste après le melon. This is the first record of poxvirus in porpoises (Phocoenidae) and also the first report for dusky dolphins, and generally for cetaceans of the southern hemisphere. This distinctive looking cetacean is closely related to other large marine animals. Experts have named dusky dolphins as the most active of all dolphins. It has virtually no beak, as the head slopes evenly down from the blowhole to the tip of the snout. Dusky Dolphin - Lagenorhynchus obscurus Scientific classification Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Artiodactyla Infraorder: The rostrum is short and clearly demarcated from the melon (forehead). The dusky dolphin (Lagenorhynchus obscurus) is a dolphin found in coastal waters in the Southern Hemisphere.Its specific epithet is Latin for "dark" or "dim". The dusky dolphin is a medium-sized dolphin, ranging from 1.8m to 2m in length. Other names: Fitzroy's dolphin in Argentina.
Fortunately for them, Dusky dolphins are no longer popular with the captivity industry, mainly because the few that have been caught have not adapted well to being confined to tanks, and have failed to reproduce. Certaines études ont mis en lumière des signatures vocales qui équivaudraient notre prénom, permettant aux membres d'un groupe de se reconnaître et de s'interpeller. Fun Facts for Kids Dusky dolphins release air and water from their lungs through a special blowhole, found on the top of their heads. Les Delphinidés (Delphinidae) forment une famille de mammifères odontocètes, comprenant entre autres les dauphins, les sténelles, les globicéphales et les orques. L'état de conscience semble altéré mais continu, avec la possibilité de repasser instantanément en réveil complet en cas de stimuli stressants. In the 1990s, between 15,000 and 20,000 dolphins were deliberately killed per year and almost 79% of the dolphins killed were dusky dolphins. Its specific epithet is Latin for "dark" or "dim". During times when there is plenty of prey available in the water closer to shore the dusky dolphins will feed together during the daytime.

Females weigh up to 150 kg (330 lb) and males 200 kg (440 lb) with males reaching 2.5 m (8.2 ft) and females 2.3 m (7.5 ft) in length.

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