أمازون (نهر)

(تم التحويل من نهر الأمازون)

The Amazon River (UK /ˈæməzən/, الأمريكي /ˈæməzɒn/; Spanish and برتغالية: Amazonas) in South America is the largest river by discharge volume of water in the world, and by some definitions it is the longest.[2][6][n 2]

Amazon River
Amazon River - Flickr - pellaea.jpg
Amazon River near Indiana, Peru
Amazonrivermap.svg
Amazon River and its drainage basin
الاسم المحلي[Amazonas] Error: {{Native name}}: missing language tag (help)  (language?)
الموقع
CountryBrazil, Colombia, Peru
CityIquitos (Peru); Leticia (Colombia);
Tabatinga (Brazil); Tefé (Brazil);
Itacoatiara (Brazil) Parintins (Brazil);
Óbidos (Brazil); Santarém (Brazil);
Almeirim (Brazil); Macapá (Brazil);
Manaus (Brazil)
السمات الطبيعية
المنبعRío Mantaro
 ⁃ الموقعHuancayo, Huancayo Province, Peru
 ⁃ الإحداثيات10°43′55″S 76°38′52″W / 10.73194°S 76.64778°W / -10.73194; -76.64778
 ⁃ المنسوب5,220 m (17,130 ft)
المصبAtlantic Ocean
 - الموقع
Brazil
 - الإحداثيات
0°42′28″N 50°5′22″W / 0.70778°N 50.08944°W / 0.70778; -50.08944Coordinates: 0°42′28″N 50°5′22″W / 0.70778°N 50.08944°W / 0.70778; -50.08944[1]
 - المنسوب
0 m (0 ft)
الطول7,000 km (4,300 mi)[n 1]
مساحة الحوض7,050,000 km2 (2,720,000 sq mi)[2]
التدفق 
 ⁃ المتوسط209,000 m3/s (7,400,000 cu ft/s)[5]
 ⁃ أدنى تدفق180,000 m3/s (6,400,000 cu ft/s)
 ⁃ أقصى تدفق340,000 m3/s (12,000,000 cu ft/s)
سمات الحوض
الروافد 
 - اليسرىMarañón, Napo, Japurá/Caquetá, Rio Negro/Guainía, Putumayo, Trombetas
 - اليمنىUcayali, Javary, Juruá, Purús, Madeira, Tapajós, Xingu
Topography of the Amazon River Basin

The headwaters of the Apurímac River on Nevado Mismi had been considered for nearly a century as the Amazon's most distant source, until a 2014 study found it to be the headwaters of the Mantaro River on the Cordillera Rumi Cruz in Peru.[12] The Mantaro and Apurímac join, and with other tributaries form the Ucayali River, which in turn meets the Marañón River upstream of Iquitos, Peru, to form what countries other than Brazil consider to be the main stem of the Amazon. Brazilians call this section the Solimões River above its confluence with the Rio Negro[13] to form what Brazilians call the Amazon at the Meeting of Waters (برتغالية: Encontro das Águas) at Manaus, the largest city on the river.

At an average discharge of about 209,000 cubic metres per second (7,400,000 cu ft/s; 209,000,000 L/s; 55,000,000 USgal/s)—approximately 6,591 cubic kilometres per annum (1,581 cu mi/a), greater than the next seven largest independent rivers combined—the Amazon represents 20% of the global riverine discharge to the ocean.[14] The Amazon basin is the largest drainage basin in the world, with an area of approximately 7,050,000 square kilometres (2,720,000 sq mi). The portion of the river's drainage basin in Brazil alone is larger than any other river's basin. The Amazon enters Brazil with only one-fifth of the flow it finally discharges into the Atlantic Ocean, yet already has a greater flow at this point than the discharge of any other river.[15][16]

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أصل الاسم

The Amazon was initially known by Europeans as the Marañón, and the Peruvian part of the river is still known by that name today. It later became known as Rio Amazonas in Spanish and Portuguese, and Amazon River in English.

The name Rio Amazonas was given after native warriors attacked a 16th-century expedition by Francisco de Orellana. The warriors were led by women, reminding de Orellana of the Amazon warriors, a tribe of women warriors related to Iranian Scythians and Sarmatians[17][18] mentioned in Greek mythology.

The word Amazon itself may be derived from the Iranian compound *ha-maz-an- "(one) fighting together"[19] or ethnonym *ha-mazan- "warriors", a word attested indirectly through a derivation, a denominal verb in Hesychius of Alexandria's gloss "ἁμαζακάραν· πολεμεῖν. Πέρσαι" ("hamazakaran: 'to make war' in Persian"), where it appears together with the Indo-Iranian root *kar- "make" (from which Sanskrit karma is also derived).[20]

ثاني أطول الانهار الرئيسية في العالم بعد نهر النيل يبلغ طوله 6463 كم و ينبع من جبال الأنديز و يصب في المحيط الاطلسي ويقع في قارة اميركا الجنوبية.


التاريخ

وصول الأوروپيين

 
Amazon tributaries near Manaus


الاستكشاف

 
Samuel Fritz's 1707 map showing the Amazon and the Orinoco

Gonzalo Pizarro set off in 1541 to explore east of Quito into the South American interior in search of El Dorado, the "city of gold" and La Canela, the "valley of cinnamon".[21] He was accompanied by his second-in-command Francisco de Orellana. After 170 kilometres (110 mi), the Coca River joined the Napo River (at a point now known as Puerto Francisco de Orellana); the party stopped for a few weeks to build a boat just upriver from this confluence. They continued downriver through an uninhabited area, where they could not find food. Orellana offered and was ordered to follow the Napo River, then known as Río de la Canela ("Cinnamon River") and return with food for the party. Based on intelligence received from a captive native chief named Delicola, they expected to find food within a few days downriver by ascending another river to the north.

الاستكشاف العلمي

 
Henry Walter Bates was most famous for his expedition to the Amazon (1848–1859).

Early scientific, zoological and botanical exploration of the Amazon River and basin took place from the 18th century through the first half of the 19th century.

الاستغلال والاستيطان بعد الاستعمار

 
Amazonas state
 
Amazon Theatre opera house in Manaus built in 1896 during the rubber boom


المسار

المنابع

 
The Amazon was thought to originate from the Apacheta cliff in Arequipa at the Nevado Mismi, marked only by a wooden cross.
 
Source of the Amazon


الأمازون الأعلى أو سوليمويس

 
Amazon River near Iquitos, Peru

Although the Ucayali–Marañón confluence is the point at which most geographers place the beginning of the Amazon River proper, in Brazil the river is known at this point as the Solimões das Águas. The river systems and flood plains in Brazil, Peru, Ecuador, Colombia and Venezuela, whose waters drain into the Solimões and its tributaries, are called the "Upper Amazon".


الأمازون السفلي

 
Meeting of Waters; the confluence of Rio Negro (black) and Amazon (sandy) near Manaus, Brazil
 
Water samples of the Solimões (left) and Rio Negro (right)


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المصب

 
Satellite image of the mouth of the Amazon River, from the north looking south

Belém is the major city and port at the mouth of the river at the Atlantic Ocean. The definition of where exactly the mouth of the Amazon is located, and how wide it is, is a matter of dispute, because of the area's peculiar geography. The Pará and the Amazon are connected by a series of river channels called furos near the town of Breves; between them lies Marajó, the world's largest combined river/sea island.


الجسور

There are no bridges across the entire width of the river.[23] This is not because the river would be too wide to bridge; for most of its length, engineers could build a bridge across the river easily. For most of its course, the river flows through the Amazon Rainforest, where there are very few roads and cities. Most of the time, the crossing can be done by a ferry, so there is no need to build a bridge. The Manaus Iranduba Bridge linking the cities of Manaus and Iranduba spans the Rio Negro (a tributary of the Amazon).

الخلاف حول الطول

 
تاكسي نهري في پيرو

While debate as to whether the Amazon or the Nile is the world's longest river has gone on for many years, the historic consensus of geographic authorities has been to regard the Amazon as the second longest river in the world, with the Nile being the longest. However, the Amazon has been reported as being anywhere between 6,275 and 7,025 kilometres (3,899 and 4,365 mi) long.[3] It is often said to be "at least" 6,400 kilometres (4,000 mi) long.[2] The Nile is reported to be anywhere from 5,499 to 7,088 kilometres (3,417 to 4,404 mi).[3] Often it is said to be "about" 6,650 kilometres (4,130 mi) long.[7] There are many factors that can affect these measurements, such as the position of the geographical source and the mouth, the scale of measurement, and the length measuring techniques (for details see also List of rivers by length).[3][4]


المفيض

The Amazon basin, the largest in the world, covers about 40% of South America, an area of approximately 7,050,000 square kilometres (2,722,020 sq mi). It drains from west to east, from Iquitos in Peru, across Brazil to the Atlantic. It gathers its waters from 5 degrees north latitude to 20 degrees south latitude. Its most remote sources are found on the inter-Andean plateau, just a short distance from the Pacific Ocean.[24]


الفيضان

 
NASA satellite image of a flooded portion of the river

Not all of the Amazon's tributaries flood at the same time of the year. Many branches begin flooding in November and might continue to rise until June. The rise of the Rio Negro starts in February or March and begins to recede in June. The Madeira River rises and falls two months earlier than most of the rest of the Amazon river.

الجيولوجيا

The Amazon River originated as a transcontinental river in the Miocene epoch between 11.8 million and 11.3 million years ago and took its present shape approximately 2.4 million years ago in the Early Pleistocene.

The proto-Amazon during the Cretaceous flowed west, as part of a proto-Amazon-Congo river system, from the interior of present-day Africa when the continents were connected, forming western Gondwana. 80 million years ago, the two continents split. Fifteen million years ago, the main tectonic uplift phase of the Andean chain started. This tectonic movement is caused by the subduction of the Nazca Plate underneath the South American Plate. The rise of the Andes and the linkage of the Brazilian and Guyana bedrock shields,[مطلوب توضيح] blocked the river and caused the Amazon Basin to become a vast inland sea. Gradually, this inland sea became a massive swampy, freshwater lake and the marine inhabitants adapted to life in freshwater.[بحاجة لمصدر]

Eleven to ten million years ago, waters worked through the sandstone from the west and the Amazon began to flow eastward, leading to the emergence of the Amazon rainforest. During glacial periods, sea levels dropped and the great Amazon lake rapidly drained and became a river, which would eventually become the world's largest, draining the most extensive area of rainforest on the planet.[25]

Paralleling the Amazon River is a large aquifer, dubbed the Hamza River, the discovery of which was made public in August 2011.[26]

المناطق المحمية

الاسم البلد الإحداثيات الصورة ملاحظات
Allpahuayo-Mishana National Reserve Peru 3°56′S 73°33′W / 3.933°S 73.550°W / -3.933; -73.550
Amacayacu National Park Colombia 3°29′S 72°12′W / 3.483°S 72.200°W / -3.483; -72.200
Amazônia National Park Brazil 4°26′S 56°50′W / 4.433°S 56.833°W / -4.433; -56.833
Anavilhanas National Park Brazil 2°23′S 60°55′W / 2.383°S 60.917°W / -2.383; -60.917


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النبيت والوحيش

النبيت

الوحيش

 
The tambaqui, an important species in Amazonian fisheries, breeds in the Amazon River

More than one-third of all known species in the world live in the Amazon rainforest,[31] a giant tropical forest and river basin with an area that stretches more than 5,400,000 square kilometres (2,100,000 sq mi). It is the richest tropical forest in the world in terms of biodiversity. There are over 3,000 species of fish currently recognised in the Amazon basin, with more being discovered every year.[32] In addition to the thousands of species of fish, the river supports crabs, algae, and turtles.

الثدييات

Along with the Orinoco, the Amazon is one of the main habitats of the boto, also known as the Amazon river dolphin (Inia geoffrensis). It is the largest species of river dolphin, and it can grow to lengths of up to 2.6 metres (8 ft 6 in). The colour of its skin changes with age; young animals are gray, but become pink and then white as they mature. The dolphins use echolocation to navigate and hunt in the river's tricky depths.[33] The boto is the subject of a legend in Brazil about a dolphin that turns into a man and seduces maidens by the riverside.[34]

The tucuxi (Sotalia fluviatilis), also a dolphin species, is found both in the rivers of the Amazon basin and in the coastal waters of South America. The Amazonian manatee (Trichechus inunguis), also known as "seacow", is found in the northern Amazon River basin and its tributaries. It is a mammal and a herbivore. Its population is limited to freshwater habitats, and, unlike other manatees, it does not venture into salt water. It is classified as vulnerable by the International Union for Conservation of Nature.[35]

The Amazon and its tributaries are the main habitat of the giant otter (Pteronura brasiliensis).[36] Sometimes known as the "river wolf," it is one of South America's top carnivores. Because of habitat destruction and hunting, its population has dramatically decreased. It is now listed on Appendix I of the Convention on International Trade in Endangered Species (CITES), which effectively bans international trade.[37]

الطيور

الزواحف

The anaconda is found in shallow waters in the Amazon basin. One of the world's largest species of snake, the anaconda spends most of its time in the water with just its nostrils above the surface. Species of caimans, that are related to alligators and other crocodilians, also inhabit the Amazon as do varieties of turtles.[38]

الأسماك

 
Characins, such as the piranha species, are prey for the giant otter, but these aggressive fish may also pose a danger to humans.

The Amazonian fish fauna is the centre of diversity for neotropical fishes. 5,600 species are currently known, and approximately fifty new species are discovered each year.[39][40] The arapaima, known in Brazil as the pirarucu, is a South American tropical freshwater fish, one of the largest freshwater fish in the world, with a length of up to 15 feet (4.6 m).[41] Another Amazonian freshwater fish is the arowana (or aruanã in Portuguese), such as the silver arowana (Osteoglossum bicirrhosum), which is a predator and very similar to the arapaima, but only reaches a length of 120 centimetres (47 in). Also present in large numbers is the notorious piranha, an omnivorous fish that congregates in large schools and may attack livestock and even humans. There are approximately 30 to 60 species of piranha. However, only a few of its species are known to attack humans, most notably Pygocentrus nattereri, the red-bellied piranha. The candirú, native to the Amazon River, is a species of parasitic fresh water catfish in the family Trichomycteridae,[42] just one of more than 1200 species of catfish in the Amazon basin. Other catfish 'walk' overland on their ventral fins,[43] while the kumakuma (Brachyplatystoma filamentosum), aka piraiba or "goliath catfish", can reach 3.6 metres (12 ft) in length and 200 kilograms (440 lb) in weight.[44]

The electric eel (Electrophorus electricus) and more than 100 species of electric fishes (Gymnotiformes) inhabit the Amazon basin. River stingrays (Potamotrygonidae) are also known. The bull shark (Carcharhinus leucas) has been reported 4,000 kilometres (2,500 mi) up the Amazon River at Iquitos in Peru.[45]

الفراش

Microbiota

Freshwater microbes are generally not very well known, even less so for a pristine ecosystem like the Amazon. Recently, metagenomics has provided answers to what kind of microbes inhabit the river.[46] The most important microbes in the Amazon River are Actinobacteria, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria and Crenarchaeota.

الروافد الرئيسية

 
Solimões, the section of the upper Amazon River
 
Aerial view of an Amazon tributary

The Amazon has over 1,100 tributaries, 12 of which are over 1,500 kilometres (930 mi) long.[47] Some of the more notable ones are:

قائمة حسب الطول

  1. 6,400 km (4,000 mi)[2] (6,275 to 7,025 km (3,899 to 4,365 mi))[3] – Amazon, South America
  2. 3,250 km (2,020 mi) – Madeira, Bolivia/Brazil[48]
  3. 3,211 km (1,995 mi) – Purús, Peru/Brazil[49]
  4. 2,820 km (1,750 mi) – Japurá or Caquetá, Colombia/Brazil[50]
  5. 2,639 km (1,640 mi) – Tocantins, Brazil[51]
  6. 2,627 km (1,632 mi) – Araguaia, Brazil (tributary of Tocantins)[52]
  7. 2,400 km (1,500 mi) – Juruá, Peru/Brazil[53]
  8. 2,250 km (1,400 mi) – Rio Negro, Brazil/Venezuela/Colombia[54]
  9. 1,992 km (1,238 mi) – Tapajós, Brazil[55]
  10. 1,979 km (1,230 mi) – Xingu, Brazil[56]
  11. 1,900 km (1,200 mi) – Ucayali River, Peru[57]
  12. 1,749 km (1,087 mi) – Guaporé, Brazil/Bolivia (tributary of Madeira)[58]
  13. 1,575 km (979 mi) – Içá (Putumayo), Ecuador/Colombia/Peru
  14. 1,415 km (879 mi) – Marañón, Peru
  15. 1,370 km (850 mi) – Teles Pires, Brazil (tributary of Tapajós)
  16. 1,300 km (810 mi) – Iriri, Brazil (tributary of Xingu)
  17. 1,240 km (770 mi) – Juruena, Brazil (tributary of Tapajós)
  18. 1,130 km (700 mi) – Madre de Dios, Peru/Bolivia (tributary of Madeira)
  19. 1,100 km (680 mi) – Huallaga, Peru (tributary of Marañón)

انظر أيضاً

ملاحظات

  1. ^ The length of the Amazon River is usually said to be "at least" 6,400 km (4,000 mi),[2] but reported values lie anywhere between 6,275 km (3,899 mi) and 7,025 km (4,365 mi).[3] The length measurements of many rivers are only approximations and differ from each other because there are many factors that determine the calculated river length, such as the position of the geographical source and the mouth, the scale of measurement, and the length measuring techniques (for details see also List of rivers by length).[3][4]
  2. ^ The Nile is usually said to be the longest river in the world, with a length of about 6,650 km,[7] and the Amazon the second longest, with a length of at least 6,400 km.[2] In recent decades debate has intensified over the true source and the placement of the mouth, and therefore the length of the Amazon River.[8][9] Brazilian and Peruvian Studies in 2007 and 2008 added the waterway from the Amazon's southern outlet through tidal canals and the Pará estuary of the Tocantins and then concluded that the Amazon has a length of 6,992 km and was longer than the Nile, whose length was calculated as 6,853 km.[10] A peer-reviewed article, published in 2009, states a length of 7,088 km for the Nile and 6,575 km for the Amazon, measured by using a combination of satellite image analysis and field investigations to the source regions.[3] Therefore, as of 2018 the length of both rivers remains open to interpretation and continued debate.[2][11]

المراجع

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  3. ^ أ ب ت ث ج ح خ Liu, Shaochuang; Lu, P; Liu, D; Jin, P; Wang, W (1 March 2009). "Pinpointing the sources and measuring the lengths of the principal rivers of the world". Int. J. Digital Earth. 2: 80–87. doi:10.1080/17538940902746082.
  4. ^ أ ب "Where Does the Amazon River Begin?". National Geographic News. 15 February 2014. Retrieved 25 December 2018.
  5. ^ Seyler, Patrick; Laurence Maurice-Bourgoin; Jean Loup Guyot. "Hydrological Control on the Temporal Variability of Trace Element Concentration in the Amazon River and its Main Tributaries". Geological Survey of Brazil (CPRM). Archived from the original on 21 يوليو 2011. Retrieved 24 يوليو 2010.
  6. ^ "What is the world's longest river". National Geographic. Archived from the original on 6 October 2017.
  7. ^ أ ب "Nile River". Encyclopædia Britannica. 2010. Archived from the original on 29 أبريل 2015. Retrieved 3 أغسطس 2010.
  8. ^ خطأ استشهاد: وسم <ref> غير صحيح؛ لا نص تم توفيره للمراجع المسماة bbc-amazon
  9. ^ Roach, John. "Amazon Longer Than Nile River, Scientists Say". National Geographic. Retrieved 4 March 2015.
  10. ^ خطأ استشهاد: وسم <ref> غير صحيح؛ لا نص تم توفيره للمراجع المسماة inpe
  11. ^ "How Long Is the Amazon River?". Encyclopedia Britannica (in الإنجليزية). Retrieved 24 December 2018.
  12. ^ James Contos; Nicholas Tripcevich (March 2014). "Correct placement of the most distant source of the Amazon River in the Mantaro River drainage" (PDF). Area. 46 (1): 27–39. doi:10.1111/area.12069.
  13. ^ Penn, James R. (2001). Rivers of the World. ABC-CLIO. p. 8. ISBN 978-1-57607-042-0. Archived from the original on 15 أكتوبر 2015.
  14. ^ Moura, Rodrigo L.; Amado-Filho, Gilberto M.; Moraes, Fernando C.; Brasileiro, Poliana S.; Salomon, Paulo S.; Mahiques, Michel M.; Bastos, Alex C.; Almeida, Marcelo G.; Silva, Jomar M.; Araujo, Beatriz F.; Brito, Frederico P.; Rangel, Thiago P.; Oliveira, Braulio C.V.; Bahia, Ricardo G.; Paranhos, Rodolfo P.; Dias, Rodolfo J. S.; Siegle, Eduardo; Figueiredo, Alberto G.; Pereira, Renato C.; Leal, Camellia V.; Hajdu, Eduardo; Asp, Nils E.; Gregoracci, Gustavo B.; Neumann-Leitão, Sigrid; Yager, Patricia L.; Francini-Filho, Ronaldo B.; Fróes, Adriana; Campeão, Mariana; Silva, Bruno S.; Moreira, Ana P.B.; Oliveira, Louisi; Soares, Ana C.; Araujo, Lais; Oliveira, Nara L.; Teixeira, João B.; Valle, Rogerio A.B.; Thompson, Cristiane C.; Rezende, Carlos E.; Thompson, Fabiano L. (1 April 2016). "An extensive reef system at the Amazon River mouth". Science Advances (in الإنجليزية). 2 (4): e1501252. doi:10.1126/sciadv.1501252. PMC 4846441. PMID 27152336. Archived from the original on 24 April 2016. Retrieved 23 April 2016.
  15. ^ Tom Sterling: Der Amazonas. Time-Life Bücher 1979, 7th German Printing, p. 19.
  16. ^ Smith, Nigel J.H. (2003). Amazon Sweet Sea: Land, Life, and Water at the River's Mouth. University of Texas Press. pp. 1–2. ISBN 978-0-292-77770-5. Archived from the original on 15 سبتمبر 2015.
  17. ^ Apollonius Rhodius, Argonautica, Book 2
  18. ^ Argonautica Book 2
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  20. ^ Lagercrantz, Xenia Lidéniana (1912), 270ff., cited after Hjalmar Frisk, Greek Etymological Dictionary (1960–1970)
  21. ^ Francisco de Orellana Francisco de Orellana (Spanish explorer and soldier) Archived 3 مايو 2009 at the Wayback Machine. Encyclopædia Britannica.
  22. ^ "Charles-Marie de La Condamine (French naturalist and mathematician)". Encyclopædia Britannica Online. Archived from the original on 25 July 2014. Retrieved 18 July 2014.
  23. ^ "Amazon (river)" (2007 ed.). Microsoft Encarta Online Encyclopedia. Archived from the original on 6 March 2008. Retrieved 12 August 2007.
  24. ^ Church 1911, p. 784.
  25. ^ Figueiredo, J.; Hoorn, C.; van der Ven, P.; Soares, E. (2009). "Late Miocene onset of the Amazon River and the Amazon deep-sea fan: Evidence from the Foz do Amazonas Basin". Geology. 37 (7): 619–22. doi:10.1130/g25567a.1.
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  27. ^ "Allpahuayo Mishana" (in الإسبانية). Servicio Nacional de Áreas Naturales Protegidas por el Estado. Archived from the original on 13 September 2016.
  28. ^ "Parque Nacional Natural Amacayacu" (in الإسبانية). Parques Nacionales Naturales de Colombia. Archived from the original on 2 February 2017.
  29. ^ "Parna da Amazônia". Instituto Socioambiental (ISA). Archived from the original on 30 October 2016.
  30. ^ "Parna de Anavilhanas". Instituto Socioambiental (ISA). Archived from the original on 6 May 2016.
  31. ^ World Bank (15 ديسمبر 2005). "Brazilian Amazon rain forest fact sheet". Archived from the original on 3 مايو 2014. Retrieved 16 يوليو 2017.
  32. ^ Albert, J. S.; Reis, R. E., eds. (2011). Historical Biogeography of Neotropical Freshwater Fishes. Berkeley: University of California Press.
  33. ^ "Amazon River Dolphin". Rainforest Alliance. Archived from the original on 1 March 2011. Retrieved 20 March 2011.
  34. ^ Cravalho, Michael A. (1999). "Shameless Creatures: an Ethnozoology of the Amazon River Dolphin". Ethnology. 38 (1): 47–58. doi:10.2307/3774086. JSTOR 3774086.
  35. ^ "Manatees: Facts About Sea Cows". Live Science. Retrieved 17 June 2018.
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