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Science & Nature • Zoology

Crocodile

Crocodiles are large, semiaquatic reptiles in the order Crocodylia, found mainly in tropical regions of Africa, Asia, Australia, and the Americas.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

Crocodiles are large, semiaquatic reptiles in the order Crocodylia, found mainly in tropical regions of Africa, Asia, Australia, and the Americas. They are carnivorous predators with powerful jaws, strong senses, and a long evolutionary history. Living species vary in size, with the saltwater crocodile among the largest living reptiles.

Classification and biology

Crocodiles are reptiles in the order Crocodylia and are closely related to alligators, caimans, and gharials. They have tough, scaled skin, strong jaws, and eyes, ears, and nostrils positioned high on the head for life in water.

Habitat and distribution

Most crocodiles live in tropical wetlands, rivers, lakes, swamps, estuaries, or mangrove habitats. Their range includes parts of Africa, Asia, Australia, and the Americas.

Diet and behaviour

Crocodiles are carnivorous ambush predators that feed on a wide range of animals, including fish and birds. Some species are mostly nocturnal, and they rely on stealth, speed, and strong senses to catch prey.

Species diversity and size

Living crocodiles include roughly 13 to 14 species, depending on how they are classified. Sizes vary widely, from the dwarf crocodile to the much larger saltwater crocodile.

Conservation

Several crocodile species face conservation threats, including species listed as vulnerable, endangered, or critically endangered in source material. Habitat loss, hunting, and conflict with humans are among the major pressures mentioned in general references.

Key facts

  • Crocodiles are large, semiaquatic reptiles found in tropical regions worldwide.
  • They are carnivorous ambush predators with powerful jaws and strong senses.
  • Species range from the dwarf crocodile to the saltwater crocodile, the largest living reptile.
  • Crocodiles have existed for about 240 million years.
  • Several species are threatened or endangered due to habitat loss and hunting.
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Canadian context

Crocodiles are relevant to Canadian readers through zoology education, conservation coverage, and zoo collections, but they are not native to Canada.

Frequently asked questions

What is a crocodile?
A crocodile is a large, semiaquatic carnivorous reptile in the order Crocodylia.
Where do crocodiles live?
Crocodiles live mainly in tropical regions near rivers, lakes, wetlands, estuaries, lagoons, and mangrove swamps.
What do crocodiles eat?
Crocodiles eat meat, including fish, birds, turtles, mammals, frogs, and crustaceans.
How many species of crocodiles are there?
Sources in the search results give different counts, but most commonly cite about 13 to 14 living species.
What is the largest crocodile species?
The saltwater crocodile is the largest living crocodile species and is also widely described as the largest living reptile.
What is the smallest crocodile species?
The dwarf crocodile is generally identified as the smallest living crocodile species.

References

  1. World Animal Protection Australiahttps://www.worldanimalprotection.org.au/education/animal-facts/crocodiles/
    Supports: General facts on crocodile biology, distribution, species count, senses, age, and ecological role.
  2. FactAnimalhttps://factanimal.com/crocodiles/
    Supports: Habitat, distribution, species count, size range, and conservation status overview.
  3. BBC Earthhttps://www.bbcearth.com/factfiles/animals/amphibians-reptiles/crocodile
    Supports: General description of crocodiles as semi-aquatic reptiles with a long evolutionary lineage.
  4. Encyclopaedia Britannicahttps://www.britannica.com/animal/crocodile-order
    Supports: Taxonomic placement and general description of crocodiles as Crocodylia.
  5. Britannica Kidshttps://kids.britannica.com/kids/article/crocodile/354338
    Supports: Habitat, appearance, feeding, reproduction, and size variation.
  6. Live Sciencehttps://www.livescience.com/28306-crocodiles.html
    Supports: Species count, size range, diet, distribution, and endangered species example.