We are the IUCN-SSC Crocodilian Specialist Group. Moving forward for crocodilian conservation since 1971. 🐊
Joined December 2019
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Crocodile surveys and Nesting season - An update from the Dominican Republic at Lago Enriquillo regarding their American crocodiles, Crocodylus acutus.
Read about it here : iucncsg.org/365_docs/attachm…
ALT Researcher holding a hatchling crocodile in their hand.
ALT Two photos above showing a crocodile nest and eggs, with the bottom two photos showing a game trail camera set up and researcher setting it up on a tree.
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Crocodilian Redlist Authority Update: As of March 2026, of the 23 species of crocodilians that have been assessed, 7 are listed as Critically Endangered, 1 as Endangered and 3 as Vulnerable.
Learn more: iucncsg.org/365_docs/attachm…
Photo: Mecistops leptorhynchus by Jen Brueggen.
ALT Juvenile Central African slender snouted crocodile basking on a fallen tree trunk.
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There are also 12 species listed as Least Concern. Two species are listed as Not Evaluated, although assessments are currently being drafted. No crocodilians have been listed in the extinct or data deficient categories.
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Tanned Teeth 🐊 Crocodilians replace their teeth and go through thousands throughout their lifetimes. So even if it's stained today, a pearly white will replace it soon.
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Some crocodilians, like this Estuarine crocodile (Crocodylus porosus) live in river-systems that have tannins in the water from natural organic material like fallen leaves and other decaying vegetation, and it will stain a crocodile's teeth. Photo by David White/ Solar Whisper.
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Crocodilians are protective mothers. 🐊 They will deposit their eggs in a nest and then guard the nest until the babies are ready to hatch.
Photo: Adult Indian Gharial (Gavialis gangeticus) on the nest bank with hatchlings in the water behind them, by Phoebe Griffith.
ALT Indian Gharial basking on the bank next to the river, where baby gharial have hatched and are sticking close to the adult in the water.
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When she hears their chirping calls, she will help the hatchlings from the nest and continue to guard them until they are old enough to go fend for themselves.
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Boosting the Gharial population in the Ghaghra River in Uttar Pradesh, India🐊
The global adult population is estimated to be around 650 individuals, and the species is listed as Critically Endangered on the IUCN Red List. iucncsg.org/365_docs/attachm…
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Restoration of the Critically Endangered Siamese crocodile to the Xe Champhone Wetands in Lao PDR (2025) 🐊 The Siamese crocodile (Crocodylus siamensis) is ranked as one of the most critically endangered crocodilians in the world.
iucncsg.org/365_docs/attachm…
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Fewer than 1000 adult C. siamensis are now thought to survive in the wild, with most populations being small, fragmented, and of questionable reproductive viability (Platt et al. 2019).
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Crocodilians can be found in a variety of habitats all over the world (except the North and South Polar regions). Some spend their lives in freshwater, while others, like the American crocodile (Crocodylus acutus) spend the majority of their lives in saltwater habitats.
ALT American crocodile on the edge of the bank with partial head and body out of the water.
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Because their bodies need to get rid of the excess salt, they have glands on their tongues that do this. Alligators and caimans do NOT have salt-excreting glands, and therefore spend a limited (if any) amount of time in brackish (half salt/freshwater) and saltwater environments.
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Honoring a legacy of Everglades Stewardship: The Rafael Crespo Conservation Award 🐊
Read more about this in the October - December 2025 Newsletter: iucncsg.org/365_docs/attachm…
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American crocodile (Crocodylus acutus) nesting ecology, reproductive success, and management in the Ojo de Agua-Monte Cabaniguán Wildlife Refuge in Cuba. 🐊
Read more in our October - December 2025 Newsletter: iucncsg.org/365_docs/attachm…
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When it comes to building a nest to deposit their eggs, crocodilians have choices: either building a mound with vegetation or digging a hole in sandy soils. In some situations, they might do a combo of the 2.
Hatchling Mugger crocodile (Crocodylus palustris) by Phoebe Griffith
ALT Hatchling crocodiles in the nest next to a white eggshell.
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Mugger crocodiles (Crocodylus palustris) in the polluted urban waters of the Vishwamitri River at Vadodara City 🐊 Economic growth is crucial, but it can also lead to rapid urbanization and development, often causing the loss of natural environments and environmental degradation.
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This species not only survives in polluted waters but have also adapted to crowded human environments. Read more about this in our October - December 2025 Newsletter: iucncsg.org/365_docs/attachm…
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The Yellow Caiman of Venezuela 🐊 A population of yellow Caiman crocodilus was noted in November 2024, while monitoring the Orinoco crocodile (Crocodylus intermedius) population in the Capanaparo River in Apure State.
ALT Two different images. The top image is of a pale brown caiman sitting on a rock above the water's surface. The bottom image is marsh habitat with a caiman on the shore and a bird next to it.
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"We visited different areas along the river during the day where local communities had reported the presence of the species. At one of these sites (6° 49’ 25.8’’N,69°23’ 40.7’’W), we observed a yellow crocodile, approximately 3 m in length, on a beach surrounded by small bushes."
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Read more about them in our October - December 2025 Newsletter: iucncsg.org/365_docs/attachm…
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