Selasa, 18 September 2012

Dusky Dolphins


The Biggest Animals Kingdom and in The World | Dusky Dolphins | The dolphin is unclear small to medium length in relation to other species of the family. The dark dolphins off the coast of Peru, where they are up to 210 cm (6 feet) in length and 100 kg of thrust (210 pounds) weight. The dolphin back is dark gray or black, and the dorsal fin is clearly bicolor corresponding margin of the back in color, but the rear edge is much lighter gray white. Dolphins have long dark gray spot on the front, a short beak and dark things. The skull of a dolphin has a dark beak longer and narrower than that of a dolphin or an hourglass dolphin Peale same age and size

The dolphin has a dark semi-discontinuous circumpolar region. Dolphins can be found off the coast of South America, southwestern Africa, South Australia and Tasmania, New Zealand and some oceanic islands. From South America, dark dolphins beach in the south of Peru to Cape Horn in the western and southern Patagonia at about 36 ° S in the east. Dolphins are dark in New Zealand waters. In Africa, the dark areas of dolphins in the Bay of Lobito, Angola, north of False Bay, South Africa in the south. Dolphins in Australian waters were taken in a dark cold waters off Kangaroo Iceland, Tasmania and eastern Bass Strait, although they are rare and observed in New Zealand, it may be transient.

Dolphins prefer dark and cold water upwelling of cold streams. Dark Dolphins over large distances (780 km), but are not well defined seasonal migrations. In Argentina, dark dolphins closely associated with Southern Right whales and sea lions from South America. They were found about dolphins, but apparently not communicate with them and feed Risso's dolphin. In New Zealand, to mix dark dolphins common dolphins. Dark dolphins were also observed with the dolphins in the Southern Right Whales and pilot whales from southwestern Africa. Dark dolphins live in fission-fusion of the Company with the size of most groups will decline during foraging and the size of the groups. During rest and travel in the Golfo San José from Peninsula Valdes, dolphins regularly alternating small and large groups, groups and socio-sexual encounter a variety of partners.

Studies of dolphins of Kaikoura, New Zealand, normally dolphins live in large groups, which are divided into smaller subgroups. These subgroups of adults coupling (contact groups) composed mothers with small groups (kindergarten) and non-breeding adults. Dark Dolphins a promiscuous mating in which men and women who mate with multiple partners. In contact groups males behind the females at high speed to pursue. Unlike the male dolphins dolphins dark males can monopolize females. The time can be as women dark dolphins first reproduce vary by region. New Zealand first reproduce the dolphins at about 7-8 years 6-7 years possibly with dolphins in Argentina.

As with all types of couples where women with multiple partners, men have testicles and dark Dolphins Dolphins sperm competitionDusky sometimes engage in sexual behavior for reasons other than reproduction, perhaps duties greeting or to increase social communication. Homosexual behavior between males was observed. Dolphins have sex for social reasons tend to be more relaxed. Females with young often in groups in shallow water nurseries to collect. The formation of groups of kindergarten shallow waters also allow the members, prey that hunt live in these waters. Adults and calves were observed to hunt and fish, and adults can learn how to hunt calves.

Nursery groups have a tendency to avoid contact groups. Adult males in these groups of women aggressive herd and hunting. Dolphin mother cares for calves that do not take themselves. The dark dolphin in most of its range only. Dolphins can Extending this fishery darkest victims of fishing small cetaceans in Peru and Chile. The dark dolphin is listed in Annex II of the Convention on the Conservation of Migratory Species of Wild Animals (CMS).
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