Editing Amazon river dolphin (section)

==Description==
[[File:Amazon river dolphin.jpg|thumb|left|Male Amazon river dolphins are either solid pink or mottled grey/pink.]]
The Amazon river dolphin is the largest [[river dolphin]]. Adult males reach a maximum length and weight of {{convert|2.55|m|ft}} (average {{convert|2.32|m|ft}}) and {{convert|185|kg|lbs}} (average {{convert|154|kg|lbs}}), while females reach a length and weight of {{convert|2.15|m|ft}} (mean {{convert|2|m|ft}}) and {{convert|150|kg|lbs}} (average {{convert|100|kg|lbs}}). It has very evident sexual dimorphism, with males measuring and weighing between 16% and 55% more than females, making it unique among [[river dolphin]]s, where females are generally larger than males.<ref name=martin>{{cite journal|last1=Martin|first1=A.|first2=V.|last2=da Silva|year=2006|title=Sexual dimorphism and body scarring in the boto (Amazon River dolphin) ''Inia geoffrensis''|journal=Marine Mammal Science|volume=22|issue=1 |pages=25–33|url=http://www.avvx62.dsl.pipex.com/boto/pdfs/4_2006_mms.pdf|doi=10.1111/j.1748-7692.2006.00003.x|bibcode=2006MMamS..22...25M |access-date=22 November 2015|archive-url=https://web.archive.org/web/20131216053838/http://www.avvx62.dsl.pipex.com/boto/pdfs/4_2006_mms.pdf|archive-date=16 December 2013|url-status=dead}}</ref>

The texture of the body is robust and strong but flexible. Unlike in [[oceanic dolphin]]s, the cervical vertebrae are not fused, allowing the head to turn 90 degrees.<ref name=Cooke/> The flukes are broad and triangular, and the dorsal fin, which is keel-shaped, is short in height but very long, extending from the middle of the body to the caudal region. The pectoral fins are large and paddle-shaped. The length of its fins allows the animal to perform a circular movement, allowing for exceptional maneuverability to swim through the [[flooded forest]] but decreasing its speed.<ref name=best/>

The body color varies with age. Newborns and the young have a dark grey tint, which in adolescence transforms into light grey, and in adults turns pink as a result of repeated abrasion of the skin surface. Males tend to be pinker than females due to more frequent trauma from intra-species aggression. The color of adults varies between solid and mottled pink and in some adults the [[dorsal surface]] is darker. It is believed that the difference in color depends on the temperature, water transparency, and geographical location. There was one [[albino]] on record, kept in [[Duisburg Zoo]]'s dolphinarium. However, as of 2020, this specimen and one other have died.<ref>{{Cite web |title=Amazon river dolphin |url=https://au.whales.org/tag/amazon-river-dolphin/ |access-date=2024-12-17 |website=Whale & Dolphin Conservation Australia |language=en-AU}}</ref> 
[[File:Inia geoffrensis 179341177.jpg|thumb|Amazon river dolphins have a [[heterodont]] dentition]]
The skull of the species is slightly asymmetrical compared to the other toothed whales. It has a long, thin snout, with 25 to 28 pairs of long and slender teeth to each side of both jaws. Dentition is [[heterodont]], meaning that the teeth differ in shape and length, with differing functions for both grabbing and crushing prey. Anterior teeth are conical and later have ridges on the inside of the crown. Despite small eyes, the species seems to have good eyesight in and out of the water. It has a [[Melon (cetacean)|melon]] on the head, the shape of which can be modified by muscular control when used for [[biosonar]]. Breathing takes place every 30 to 110 seconds.<ref name=best/>

===Longevity===
[[File:Amazonas Flussdelfin Apure Duisburg 02.jpg|thumb|left|Apure the dolphin lived for more than 40 years at the [[Duisburg Zoo]]]]
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.<ref name="Inia geoffrensis in Captivity in the United States">{{cite journal |last1=Caldwell |first1=Melba C. |last2=Caldwell |first2=David K. |last3=Brill |first3=Randall L. |title=Inia geoffrensis in Captivity in the United States |journal=IUCN Species Survival Commission |date=1986 |pages=35–41 |url=https://portals.iucn.org/library/sites/library/files/documents/SSC-OP-003_pp35-41.pdf |access-date=27 January 2022}}</ref> An individual named Baby at the [[Duisburg Zoo]], Germany, lived at least 46 years, spending 45 years, 9 months at the zoo.<ref>{{cite news|url=http://www.zoo-duisburg.de/zoo-duisburg-trauert-um-einzigartigen-flussdelfin/|title=Zoo Duisburg trauert um einzigartigen Flussdelfin|language=de|year=2020|access-date=21 December 2020|archive-date=23 January 2021|archive-url=https://web.archive.org/web/20210123080444/http://www.zoo-duisburg.de/zoo-duisburg-trauert-um-einzigartigen-flussdelfin/|url-status=dead}}</ref>