Nile Monitor
Varanus niloticus
Overview
Adult nile monitors tend to be brown to green, with dark stripes on their body and yellow spots on their legs and head. Meanwhile, juveniles are black with bright yellow spots.
They grow between 1.2m and 2.2m long, growing throughout their lives. Weight ranges from 0.8kg to 15kg, with great variation across size and environmental factors. Males tend to be larger and heavier than females.
- Found in
- Sub-Saharan Africa and Nile Delta
- Class
- Reptilia
- Order
- Squamata
- Family
- Varanidae
- Genus
- Varanus
Conservation Status
Due to its wide distribution across sub-Saharan Africa and adaptability to a range of habitats, the Nile monitor is considered a species of Least Concern. However, local populations face increasing conservation struggles from habitat conversion and overharvesting for their skins. Wetland drainage and human expansion destroy critical nesting and foraging areas. Their reliance on specific microhabitats for burrowing and nesting make them susceptible to long-term decline if habitat degradation continues.
The Nile monitor is not a focus of conservation efforts in most regions, though some countries include them in wildlife protection laws, and international trade is restricted under CITES Appendix II; but legislation is not often enforced, and data collection is minimal. They benefit, however, from general habitat restoration initiatives that include them as part of the natural biodiversity.
In regions where Nile monitors are invasive, i.e. Florida, management includes trapping and public reporting systems to control populations and protect native species.
- Wild Population
- Unknown
- Conservation Status
- Least concern
Animal Facts
- Many female Nile monitors break into termite nests and lay their eggs inside them because the termites repair the damage afterwards and thus shelter the eggs.
- When in danger or antagonised, the Nile monitor will attack with a powerful whip from its long tail.
- Nile monitors are preyed upon by martial eagles, which can pick up and carry a lizard weighing up to 4kg.
- Nile monitors are causing the crocodile and alligator population in Florida to decrease because they are so effective at robbing their nests of eggs and hatchlings.
- Nile monitors never stop growing; they continue to get larger throughout their lives.
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Social & Reproduction
Nile monitors are solitary animals and prefer to be alone.
Nile monitors mate from June to October. After tracking a female by scent, a male will follow her until one of two scenarios: either she allows him to mate with her, or he gives up. If two or more males meet when tracking females then they will fight, or the smaller monitor will yield to the larger one immediately.
Having mated, a female will carry her eggs with her until the rainy season. After a rainfall, she will dig a nest in the soft ground before covering her eggs over, and these will incubate for 3 to 10 months depending on the environmental conditions. The newly hatched young must dig their way out of the nest and may need to wait for it to rain to be able to get out, although some mothers do return to their nests to help.
After hatchlings emerge, they live independently and reach sexual maturity at 3 to 4 years old.