Reptiles
Nile Crocodile
Crocodylus niloticus · also called African crocodile, common crocodile
The Nile crocodile is the apex predator of Africa’s rivers, lakes, and swamps — a huge, ancient, ambush hunter that takes prey up to the size of a buffalo, cares for its young with a diligence rare among reptiles, and kills more people than almost any other large animal on the continent.
Overview
Nile crocodiles are found in fresh and brackish water throughout sub-Saharan Africa, along the Nile, and on Madagascar — rivers, lakes, reservoirs, marshes, mangrove swamps, and estuaries. They bask on banks and sandbars by day and hunt mainly at night, and they can move surprisingly fast on land over short distances, though they tire quickly. They tolerate a range of conditions and, unusually for a crocodilian, sometimes travel considerable distances overland between waterbodies.
Built to ambush
A Nile crocodile hunts by stealth and patience. It floats with only its eyes and nostrils above the surface, drifts within range of an animal drinking or crossing, and attacks in an explosive lunge, gripping with a bite of around 5,000 psi — one of the most powerful in the animal kingdom. It then drags the prey underwater to drown it and, because it cannot chew, tears off chunks with a spinning death roll. Large crocodiles can bring down zebra, wildebeest, and young hippos, and packs of crocodiles cooperate loosely at big carcasses.
The metabolism is extraordinarily efficient: a large meal can sustain a crocodile for months to a year, with energy stored as fat in the tail.
Attentive parents
Female Nile crocodiles are exemplary mothers by reptile standards. Each digs a nest hole in a sandy bank, lays 25 to 80 eggs, and guards it for about three months, tolerating almost no disturbance. Nest temperature determines the hatchlings’ sex. When the babies pip and call, the mother excavates them, carries them to the water in a special pouch in her lower jaw, and continues to protect the crèche — often with the male’s help — against herons, monitor lizards, and other predators for several weeks.
Danger to people
The Nile crocodile’s size, hunting method, and overlap with human water use make it exceptionally hazardous. Hundreds of people are killed each year across Africa, mostly while fishing, bathing, doing laundry, or fetching water, and thousands more are injured. Because these events happen in rural areas and are poorly recorded, the crocodile’s true impact is often underestimated in global “deadliest animal” lists.
Status
Once heavily hunted for its belly skin, the Nile crocodile is now Least Concern and its population has recovered to hundreds of thousands, secure across most of its range thanks to protection, CITES trade regulation, and commercial farming. Remaining threats are habitat loss, water pollution, bycatch in gillnets, and retaliatory killing where crocodiles and people compete for the same rivers.
Nile Crocodile: common questions
How dangerous is the Nile crocodile to people?
It is one of the most dangerous large animals in the world by number of human deaths. Estimates run to several hundred fatal attacks a year across Africa, with many more non-fatal, concentrated where people fish, wash, collect water, and cross rivers in crocodile country. Large Nile crocodiles are ambush predators that take prey the size of a person without hesitation, striking from the water with no warning. Attacks are heavily under-recorded, so the true toll is probably higher.
How does a Nile crocodile catch a wildebeest?
By ambush at a bottleneck. Crocodiles gather at river crossings used by migrating wildebeest and zebra, especially in the Serengeti–Mara system, and lie motionless just under the surface. When the herd enters the water, a crocodile lunges, seizes an animal by the leg or muzzle, and drags it under, often performing a "death roll" — spinning rapidly to disorient the prey and tear off pieces, since crocodiles cannot chew. Several crocodiles may feed on one carcass together, taking turns to roll.
Do crocodiles look after their young?
Nile crocodiles are among the most attentive parents of any reptile. The female digs a nest hole in a riverbank, lays 25 to 80 eggs, and guards it closely for about three months, barely leaving even to feed. When the hatchlings call from inside the eggs, she helps dig them out, gently gathers them into her mouth, and carries them to a sheltered nursery area, where she and sometimes the male continue to guard them for weeks.
Is the Nile crocodile endangered?
No longer. Unregulated hunting for skins from the 1940s to 1960s drove severe declines, but a combination of protection, trade controls under CITES, and regulated crocodile farming and ranching allowed the species to recover, and it is now listed as Least Concern with a large, stable wild population. Local pressures remain — wetland drainage, pollution, entanglement in fishing nets, and retaliatory killing after attacks on people and livestock.