| Common Name: | Nile crocodile |
| Class: |
Reptilia |
| Order: | Crocodylia |
| Family: | Crocodylidae |
| Genus species: | Crocodylus (crocodile) niloticus (belonging to the Nile River) |
| FAST FACTS |
| FUN FACTS |
| ECOLOGY & CONSERVATION |
| BIBLIOGRAPHY |
| Description: |
a large, lizard-shaped reptile with four short legs and a long muscular tail. The hide is rough and scaled. Juvenile Nile crocodiles are dark olive to brown with darker crossbands on tail and body. Adults are uniformly dark with darker crossbands on tail. |
| Size: | averaging about 5 m (16 ft.) with maximum size about 6 m (20 ft.) |
| Weight: | adults of both sexes may easily exceed 225 kg (500 lb.) |
| Diet: | up to 70% of the adult diet is fish. Other prey items may include zebras, hippos, porcupines, pangolins, and migrating widebeest. |
| Incubation: | females nest in Nov. and Dec. on sandy shorelines, dry stream beds, or riverbanks. A female can lay 25 to 100 eggs, which she covers with sand, then guards until they hatch 3 months later. |
| Sexual maturity: | relates to size. Males are mature at about 3 m (10 ft., approximately 10 years of age), females at about 2 m (6.5 ft., approximately 10 years of age). |
| Life span: | average about 45 years in the wild, may live up to 80 years in captivity |
| Range: | found throughout tropical and southern Africa and Madagascar |
| Habitat: | in rivers, freshwater marshes, estuaries, and mangrove swamps |
| Population: | |
| Status: | listed as endangered by USFWS and protected by CITES depending on populations and country |
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| 1. |
A crocodile's ectothermic metabolism is extremely efficient. A large crocodile, which may weigh more than 900 kg (2000 lb.), can survive for long periods of time between meals! |
| 2. | If baby crocodiles are in danger, the adult female may pick them up and flip them into her mouth or gular (throat) pouch for protection. |
| 3. | When fish are migrating, crocs may hunt cooperatively by forming a semi-circle across the river and herding the fish. They then eat the fish that are closest to them. |
| 4. | When young crocodiles are hatching, either parent may help them out of the egg by rolling it between their tongue and palate. This cracks the shell allowing for an easier escape. |
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Nile crocodiles are ecologically important as predators. They help the environment by keeping barbel catfish, which are predators themselves, in check. Barbels eat other fishes which are the diet of more than 40 species of birds. If birds leave an area because there are no edible fish, the amount of bird droppings, which provides nutrients for the fish, declines, and the food chain is disrupted. Unfortunately, the Nile crocodiles' population suffers from pollution, hunting, and entanglement in gill nets. |
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CSG Newsletter, vol. 2 (1), Jan-Mar 1992. IUCN World Conservation Union Species Survival Plan Commission. |
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| Halliday, T. and K. Adler, eds. Encyclopedia of Reptiles and Amphibians. New York: Facts on File, Inc., 1987. | |
| Ross, C., ed. Crocodiles and Alligators. New York: Facts on File, Inc., 1989. | |
| Steele, R. Crocodiles. London: Cristopher Helm Ltd., 1989. | |
| Vissen, J. and T. Pooley. The Tony Pooley Guide to the Nile Crocodile and other African Crocodiles. 1982. | |
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