freshwater dolphin – See Animals Wild

Baji or Chinese river dolphin

Baija or Chinese river dolphin - Extinct

Almost definitely extinct, this species of river dolphin lived in the Yangtze and was also known as the white dolphin among other names.

The last confirmed sighting was now more than 20 years ago, and given the incredibly polluted state of their river home it is unlikely that any did survive. There may well be much debate in the future, as to whether similar river dolphins from elsewhere could replace them. What is clear is that this is irrelevant for a significant length of time, as it is likely to be many decades before the river is capable of supporting significant populations of fish, never-mind a river dolphin.

Below is a rare clip of it from before extinction, and below is any times that it is mentioned on this site. Given that it is extinct, its mentioning may not be helpful for seeing it, but may well be of interest. Below this video, is an automated list of any articles from this site which mentions this species. Unfortunately, as the species is extinct means that the local population cannot benefit from ecotourism, but there are many other species that still cling on in China. All wildlife has the capacity to bring in money for those who live nearby. Help us make this happen

Aragualan River Dolphin

Araguaian river dolphin

The Araguaian river dolphin or Araguaian boto is a South American river dolphin population native to the Araguaia–Tocantins basin of Brazil.

The recognition of I. araguaiaensis as a distinct species is still debated. It was originally distinguished from the Amazon river dolphin in January 2014. On the basis of nuclear microsatellite and mitochondrial DNA data as well as differences in skull morphology (it generally has a wider skull). It also differs from the Amazon and Bolivian river dolphins in the number of teeth per hemimandible (24–28 versus 25–29 and 31–35, respectively).

River dolphins have a complex set of acoustic calls that help shed light on their personalities, behaviours and interaction with other river dolphins. In a study by Gabriel Melo-Santos et. Al they analysed frequency contours of 727 signals They found that these signals had a critical similarity value of 96% and frequency contours were categorized into 237 sound-types. Interestingly the most notable and frequent sounds were emitted when calves were present shedding light on a close and complex mother child relationship. The findings show that the acoustic sounds of river dolphins are incredibly complex and are similar to those of by social delphinids, such as orcas and pilot whales.

The total population of the species is estimated to be of the order of 600 to 1500 individuals, and genetic diversity is limited.[4] The ecology of its habitat has been adversely affected by agricultural, ranching and industrial activities, as well as by the use of dams for hydroelectric power. The inhabited section of the Araguaia River probably extends over about 1500 km out of a total length of 2110 km. The Tocantins River habitat is fragmented by six hydroelectric dams, so the population there is at particular risk.[4] The authors of the discovery paper regard its probable eventual IUCN status to be Vulnerable or worse.

The largest number of individuals of the new species is likely to occur in and around Cantão State Park, which contains most of the lakes in the Araguaia basin. However, commercial fishermen around the park have been killing them because they sometimes steal fish from nets. Shooting is common, but around protected areas like Cantão, where the sound of a gun might attract park rangers, some fishermen have taken to putting out poisoned bait for dolphins. The southernmost population of the species is a small group of isolated individuals in the Tocantins river above the Serra da Mesa dam.

Below you will find a list of any articles which mention this species specifically, below that is a video of this species in the wild. Below this, we will list any tourism opportunities (if any that we connect with).

Amazon River Dolphin

Amazon Dolphin

The Amazon river dolphin, (other names include boto, bufeo or pink river dolphin), is a species of toothed whale endemic to South America and is classified in the family Iniidae. Three subspecies are currently recognized: Amazon river dolphin,, Bolivian river dolphin and the Orinoco river dolphin while position of Araguaian river dolphin within the clade is still unclear The three subspecies are each found in a separate river basin (in order) the Amazon basin, the upper Madeira River in Bolivia, and the Orinoco basin.

The Amazon river dolphin is the largest species of river dolphin, with adult males reaching 185 kilograms (408 lb) in weight, and 2.5 metres (8.2 ft) in length. Adults acquire a pink colour, more prominent in males, giving it its nickname “pink river dolphin”. Sexual dimorphism is very evident, with males measuring 16% longer and weighing 55% more than females.

Like other toothed whales, they have a melon, an organ that is used for bio sonar. The dorsal fin, although short in height, is regarded as long, and the pectoral fins are also large. The fin size, unfused vertebrae, and its relative size allow for improved manoeuvrability when navigating flooded forests and capturing prey.

They have one of the widest ranging diets among toothed whales, and feed on up to 53 different species of fish, such as croakers, catfish, tetras and piranhas. They also consume other animals such as river turtles, aquatic frogs, and freshwater crabs. However, this is not particularly surprising, as there are so many forms of life in the Amazon rainforest, and plenty is likely to occasionally find themselves in the river.

In 2018, this species was classed as endangered, by the IUCN with a declining population. Threats include incidental catch in fishing lines, direct hunting for use as fish bait or predator control, damming, and pollution; as with many species, habitat loss and continued human development is becoming a greater threat.

While it is the only species of river dolphin kept in captivity, almost exclusively in Venezuela and Europe, it is difficult to train and often die very young, when kept in captivity..

Life expectancy of the Amazon river dolphin in the wild is unknown, but in captivity, the longevity of healthy individuals has been recorded at between 10 and 30 years. However, a 1986 study of the average longevity of this species in captivity in the United States is only 33 months. An individual named Baby at the Duisburg Zoo, Germany, lived at least 46 years, spending 45 years, 9 months at the zoo.

Below you will find any news articles on Amazon dolphin (though articles with both words also get sucked in). Also we will add any information on where you can go to see these in the wild, beneath both of these.

Baija or Chinese river dolphin - Extinct

Araguaian river dolphin

Amazon Dolphin

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