Après avoir consulté un produit, regardez ici pour revenir simplement sur les pages qui vous intéressent. The Amazon river dolphin can grow up to 9 feet (2.7 meters) long and can weigh as much as 400 pounds (181 kilograms). À la place, notre système tient compte de facteurs tels que l'ancienneté d'un commentaire et si le commentateur a acheté l'article sur Amazon. He has a heterodont denture since his teeth are conical in the front of the jaw while the back pieces have a flange. The Amazon River dolphin inhabits only the freshwater systems of South America. These include resident populations throughout the Amazon and Orinoco river systems, as well as in the Araguaia River in Brazil. The Amazon River dolphin, or, otherwise called Boto dolphin is one of the five river dolphins and is the most famous species of the group. The Amazon River dolphin inhabits only the freshwater systems of South America. * Their favorite fish belong to the families Sciaenidae, Cichlidae, and the one of the feared piranhas, Serrasalmidae. In some areas the number of botos has been halved or worse still, and many populations are now severely endangered. Amazon river dolphins live in a number of freshwater habitats across the Amazon River Basin. University of Chicago Press, 2015. Protecting areas in nature that river dolphins need to survive is challenging but essential for their future survival. They also have unusually large brains, with 40% more brain capacity than humans! Fish, crabs and small turtles are part of the diet of this cetacean that regularly hunts alone and consumes 2.5 percent of its total weight each day. William F. Perrin, Bernd WÃ¼rsig, J.G.M. Veuillez réessayer. River dolphins are among the most seriously threatened dolphins in the world. by Dolphins-World | Apr 25, 2017 | Species |. An Amazon river dolphin, also called a boto, pauses for an underwater portrait in Brazil. As you can imagine, this is very helpful when your prey is quick and prone to taking refuge in hard-to-reach places. This may sound comical, but at least two other species are known to perform similar rituals to impress potential mates – chimps, and humans! Living in huge rivers, small tributaries, lakes, flooded forests and submerged grasslands, botos can be found in six countries: Bolivia, Brazil, Colombia, Ecuador, Peru and Venezuela. Males and females reach sexual maturity at about five years of age or when the former is already about 2 meters in length, and the latter is between 1.60 and 1.75 meters. Quite simply, botos do not have anywhere else to go. Il n'y a pour l'instant aucun commentaire client. Other common names of this dolphin are Boto, bufeo and pink river dolphin. It is a relatively abundant freshwater cetacean with an estimated population in the tens of thousands. > Amazon River dolphin. The pectoral flippers are large and have a triangle shape. By supporting WDC, you can help Amazon River dolphins to live safe and free. Quite the charmers, male botos sometimes try and win over females by pulling some particularly alluring techniques out of the bag. Quite the charmers, male botos sometimes try and win over females by pulling some particularly alluring techniques out of the bag. Their principal anthropogenic threats are: – Overfishing. It is the only species of cetacean with heterodont dentition, and its dorsal fin is so small that it rather looks like a triangular crest. Amazon river dolphin facts, pictures and information. A world where every whale and dolphin is safe and free. The larger groups, with 12 to 15 members, are temporal associations with the purpose of feeding or mating. 11 months after mating, a single offspring is born between May and July measuring about 0.8 meters long. A full-grown dolphin can grow up to 9 feet (2.7 meters) long, weight up to 400 pounds (181 kilograms), and live to 30 years old. Aided by their unfused neck vertebrae, they can get a good look at their underwater worlds by turning their heads in all directions and checking things out from every angle. I.g. Dexterous swimmers, they can easily weave their way through submerged trees and shrubs to find their food. Page 26. The fact that the pink dolphin has a “Data Deficient” conservation status on the Red List of the International Union for the Conservation of Nature entails a danger not completely unknown, but that makes difficult to implement conservation strategies. River dolphin skulls have small eye orbits, a long snout and eyes placed on the sides of the head. These dolphins do sleep but with one eye open. Unfortunately, these beliefs have been increasingly diluted as more and more people from outside the region have set up home in the Amazon. Morphology. – Inia geoffrensis humboldtiana. As humans continue to transform rivers to serve their own needs and pollute waters, the future for river dolphins is looking particularly bleak. The “clicks” are the basis of their communication and reach from 16 to 170 kilohertz. Botos look very different to marine dolphins. Together, we can: Adopt a whale and help us protect these amazing creatures. Sometimes it looks for food at the riverbed. Il analyse également les commentaires pour vérifier leur fiabilité. Since 2008 the Amazon river dolphin has been rated as ‘Data Deficient’ by the IUCN. Wooing their ladies with clever tricks, male botos pick up floating plants or pieces of wood with their mouths, twirl in circles and then proceed to smack their chosen object on the water’s surface. However, each subspecies lives in defined areas: I. g. Geoffrensis thrives in the Amazon and Araguaia river basins except for the upper Teotonio rapids in the Madeira river basin in Bolivia. Not particularly fussy eaters, botos will happily tuck into a varied diet of over 40 species of fish, shrimps, crabs and turtles. Once transformed, the encantado leaves the river to attend parties and seduce young girls. Usually found alone, in mother-calf pairs or in small pods of 3 or 4 individuals, botos are rarely found in large groups. While sometimes 20 to 40 botos can be found feeding together in one area, it’s not particularly common and they generally prefer keeping themselves to themselves. Journey of the Pink Dolphins: An Amazon Quest. Afficher ou modifier votre historique de navigation, Recyclage (y compris les équipements électriques et électroniques), Annonces basées sur vos centres d’intérêt. This practice reduces the availability of food for the species. Academic Press, 2009. Découvrez les avantages de l'application Amazon. Support WDC by shopping for yourself or a friend. ‘Hans’ Thewissen. It is also very playful, and it has been seen pulling the aquatic grass and throwing pieces of wood. The development of hydroelectric dams in the river, alter the conditions of their habitat separating populations which reduce the availability of mating partners and the genetic diversity. Despite the understandable connection people often make with dolphins and the open ocean, botos only live in freshwater – often thousands of miles from the sea.. It is found throughout much of the Amazon and Orinoco river basins in Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela. Its speed while swimming is only 1.5 to 3.2 kilometers per hour, but it has occasional bursts reaching up to 14 to 22 kilometers per hour. Curiously, at times its food is also its friend: it usually plays with fish and turtles. Distinctive characteristic. That’s not the only difference though. Impossible d'ajouter l'article à votre liste. It is somewhat shy with humans, but sometimes it shows curiosity. Is The Amazon River Dolphin Endangered? Des tiers approuvés ont également recours à ces outils dans le cadre de notre affichage d’annonces. The female Amazon River Dolphins are able to mate around 6 to 10 years old. – Inia geoffrensis boliviensis. The Amazon River Dolphin is a group of dolphins that primarily dwell in the South Americas waters, especially in the Amazon river. Amazon River Dolphin Reproduction. This aquatic mammal lives in the Amazon River and its tributaries. WDC is working with local NGOs supporting community education and outreach work to establish support for river dolphin protection. When the rainy season arrives, they will also swim in smaller creeks, floodplains, and even into flooded forests.
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