crocodilians-crocodiles, alligators, caimans, and gharials
TRANSCRIPT
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Crocodilians:(Crocodiles, Alligators, Caimans,
and Gharials)
By: Saagar Parikh
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What are crocodilians?• The Crocodilia or Crocodylia are an order of large,
predatory, semiaquatic reptiles. • They appeared 83.5 million years ago in the Late
Cretaceous period and are the closest living relatives of birds.
• Large, solidly built, lizard-like reptiles, crocodilians have long flattened snouts, laterally compressed tails, and eyes, ears, and nostrils at the top of the head. Their skin is thick and covered in non-overlapping scales. They have conical, peg-like teeth and a powerful bite. They swim well and can move on land in a "high walk" and a "low walk", while smaller species are even capable of galloping. Conservation
Status
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Alligators
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American Alligator• Scientific Name: Alligator
mississippiensis• Mass: 507 lbs. (Male) 201 lbs. (Female) • Length: 11–15 ft. (Male) 9.8 ft. (Female)• Distribution: Southeastern United States
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Chinese Alligator• Scientific Name: Alligator sinensis
• Mass: 80 lbs. • Length: 5 ft. • Distribution: South of Yangtze River,
China
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Caimans
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Black Caiman• Scientific Name: Melanosuchus niger• Mass: 660-880 lbs. • Length: 9.2-14 ft.• Distribution: Amazon basin, and
other freshwater habitats of South America
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Broad-Snouted Caiman• Scientific Name: Caiman latirostris
• Mass: 64-137 lbs.• Length: 6.6-8.2 ft.• Distribution: Eastern and Central South
America
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Cuvier’s Dwarf Caiman• Scientific Name: Paleosuchus
palpebrosus• Mass: 13-15 lbs.• Length: 4.6 ft. (Male) 3.9 ft. (Female) • Distribution: Northern and Central South
America
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Smoothed-Fronted Caiman• Scientific Name: Paleosuchus trigonatus• Mass: 20-44 lbs. • Length: 3.9-5.2 ft.• Distribution: Amazon and Orinoco Basins
in South America
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Spectacled Caiman• Scientific Name: Caiman crocodilus
• Mass: 15-88 lbs.• Length: 5.9-6.6 ft. (Male) 4.9-5.6 ft.
(Female)• Distribution: Central and South America
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• Scientific Name: Caiman yacare• Mass: 128 lbs. (Male) 31-51 lbs. (Female)• Length: 6.6-8.2 ft. (Male) 4.6 ft. (Female)• Distribution: Central South America
Yacare Caiman
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Crocodiles
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Dwarf Crocodile• Scientific Name: Osteolaemus tetraspis
• Mass: 40-71 lbs.• Length: 4.9-6.2 ft.• Distribution: Sub-Saharan West
Africa and West Central Africa
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American Crocodile• Scientific Name: Crocodylus acutus
• Mass: 842 lbs. (Male) 381 lbs. (Female) • Length: 9.5-13.8 ft. (Male) 8.2-9.8 ft.
(Female)• Distribution: The Caribbean Islands,
Southern Florida, the Greater Antilles, Southern Mexico, Central America, Colombia and Ecuador
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Australian Freshwater Crocodile
• Scientific Name: Crocodylus johnsoni• Mass: 150 lbs. (Male) 88 lbs. (Female)• Length: 7.5-9.8 ft. (Male) 6.9 ft. (Female)• Distribution: Western
Australia, Queensland, and the Northern Territory in Australia
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Cuban Crocodile• Scientific Name: Crocodylus rhombifer
• Mass: 150–180 lbs.• Length: 6.9–7.5 ft.• Distribution: Cuba's Zapata Swamp and
the Isle of Youth
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False Gharial• Scientific Name: Tomistoma schlegelii• Mass: 420-460 lbs. (Male) 205 lbs. (Female)• Length: 11.8-12.8 ft. (Male) 10.6 ft.
(Female)• Distribution: Peninsular
Malaysia, Sarawak, and Indonesia (Sumatra, and Borneo), unknown if they remain in Java
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Morelet’s Crocodile• Scientific Name: Crocodylus moreletii
• Mass: 84–128 lbs. • Length: 13-14 ft. • Distribution: Central America and along
the Gulf of Mexico stretching through Belize, Guatemala, Mexico, and South Texas and along the Rio Grande.
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Mugger Crocodile• Scientific Name: Crocodylus palustris
• Mass: 88-440 lbs. • Length: 13-16 ft. • Distribution: Parts of
India, Bangladesh, Sri Lanka, Pakistan, Nepal, the southern tip of Iran
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New Guinea Crocodile• Scientific Name: Crocodylus
novaeguineae • Mass: N/A• Length: 11 ft. (Male) 8.9 ft. (Female)• Distribution: Papua New Guinea, Papua,
and West Papua
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Nile Crocodile• Scientific Name: Crocodylus niloticus • Mass: 150-1,540 lbs.• Length: 9.2-16.6 ft.• Distribution: Most of Africa, Madagascar,
and the Mediterranean
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Orinoco Crocodile• Scientific Name: Crocodylus intermedius
• Mass: 838-1,400 lbs. (Male) 496-699 lbs. (Female)
• Length: 12-16 ft. (Male) 9.8-10.8 ft. (Female)
• Distribution: Orinoco River basin in Colombia and Venezuela, Trinidad, and the Llanos Foothills
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Philippine Crocodile• Scientific Name: Crocodylus mindorensis
• Mass: N/A• Length: 10 ft.• Distribution: Scattered Marshes
throughout the Philippines
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Saltwater Crocodile• Scientific Name: Crocodylus porosus
• Mass: 880–3,000 lbs.• Length: 14-17 ft. (Male) 9.8 ft. (Female)• Distribution: Parts of India, Sri Lanka,
Indochina, and much of Indonesia and Australia
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Slender-Snouted Crocodile• Scientific Name: Mecistops cataphractus
• Mass: 276-717 lbs.• Length: 8.2 ft.• Distribution: Parts of Africa
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Siamese Crocodile• Scientific Name: Crocodylus siamensis
• Mass: 88-154 lbs.• Length: 6.9 ft.• Distribution: Indonesia, Brunei, East
Malaysia, Laos Cambodia, Burma, Thailand, and Vietnam
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Gharials
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Indian Gharial• Scientific Name: Gavialis gangeticus • Mass: 351-551 lbs.• Length: 9.8-16.4 ft. on average (Male) 8.9-
12.3 ft. on average (Female)• Distribution: Few national parks across
parts of India and Nepal