Crocodiles are opportunistic predators that eat almost anything they can catch, from insects and snails to buffalo and wildebeest. What a crocodile eats depends mostly on its size and age, with hatchlings starting on tiny invertebrates and adults graduating to large mammals, fish, and reptiles. Their diet also shifts depending on species and habitat, but the core pattern is consistent: crocodiles eat whatever prey is available and small enough to overpower.
Hatchlings Start Small
Baby crocodiles are nowhere near the apex predators their parents are. Hatchlings feed primarily on invertebrates, especially insects and arachnids, along with small crustaceans. Studies on wild Morelet’s crocodile hatchlings found their diet consisted mainly of these tiny invertebrates, with very little fish. As juveniles grow, they begin adding small fish, snails, and frogs to the mix.
Young American crocodiles in the Everglades follow a similar progression: hatchlings eat small fish, snails, crustaceans, and insects before transitioning to the larger prey they’ll hunt as adults. This dietary shift happens gradually as the crocodile’s body and jaws grow strong enough to handle bigger meals.
What Adult Crocodiles Eat
Adult crocodiles are generalist carnivores. The specific menu depends on where they live and what’s around, but fish is a staple across nearly all species. Beyond fish, adults regularly eat crabs, turtles, snakes, birds, and mammals of various sizes.
Adult saltwater crocodiles, the largest living reptiles, take prey as large as buffalo, wild boar, and monkeys, alongside smaller animals like crabs and turtles. Nile crocodiles in Africa are known for ambushing zebras and wildebeest at river crossings. American crocodiles in southern Florida are more modest in their diet, feeding mostly at night on fish, crabs, turtles, snakes, and small mammals. They’re shy, secretive animals that rarely conflict with humans, unlike their larger relatives in Australia and Africa.
The pattern is straightforward: the bigger the crocodile, the bigger the prey it can take. A 17-foot saltwater crocodile can eat almost anything in its environment. A 6-foot American crocodile sticks to fish and crabs.
How Crocodiles Hunt
Crocodiles are ambush predators. They hunt by stealthily stalking prey from the water, floating with just their eyes and nostrils above the surface. Many species position themselves near the water’s edge and wait for animals to come drink or bathe. When an animal gets close enough, the crocodile explodes out of the water, grabs it, and drags it below the surface to drown it.
This strategy works because of their extraordinary bite force. Saltwater crocodiles generate 3,700 pounds per square inch of bite force, the strongest ever measured in any living animal. That’s enough to clamp down on a large mammal and hold it underwater until it stops struggling. For context, a human bite generates roughly 160 psi. Once the prey is dead, crocodiles tear it into chunks by spinning their bodies violently, since their jaws are built for clamping, not chewing.
How Much They Eat
Crocodiles eat far less than you might expect for their size. Wild juvenile saltwater crocodiles consume food equal to roughly 2 to 6 percent of their body mass per week, with an average around 4 percent. That’s a fraction of what warm-blooded predators need. As cold-blooded reptiles, crocodiles burn energy slowly and can go weeks or even months between large meals, especially in cooler weather when their metabolism drops.
This efficiency is part of what makes them such successful predators. They don’t need to hunt constantly. A single large kill can sustain an adult crocodile for a surprisingly long time.
A Digestive System Built for Anything
Crocodiles swallow their food in large chunks, often with bones, shells, and hide still attached. Their stomachs handle this because crocodile stomach acid is extraordinarily strong, reaching a pH as low as 1.2 during digestion. For comparison, human stomach acid typically sits around pH 1.5 to 3.5. This intense acidity allows crocodiles to dissolve bone, shell, horn, and other tough materials that would pass through most predators undigested.
Crocodiles also swallow stones, a behavior scientists have studied for decades. These stones, called gastroliths, serve multiple purposes. They may help grind up tough food, provide a source of minerals, or aid in clearing parasites. Recent research revealed another function: the extra weight from swallowed stones helps crocodilians stay submerged longer. Stones equal to just 2.5 percent of body weight increased dive time by an average of 88 percent, with some animals extending their time underwater by as much as 117 percent. The added weight lets them take more air into their lungs and still sink, which is a direct advantage for an ambush predator that hunts from below the surface.
Feeding Underwater Without Drowning
One of the most remarkable adaptations in crocodiles is a fleshy valve at the back of the throat called the palatal valve. When closed, this valve seals the throat completely from both air and water. This means a crocodile can open its mouth underwater to grab and hold prey without water flooding into its lungs or esophagus.
The anatomy is unusual enough that biologists describe the inside of a crocodile’s mouth as essentially being “outside” its body. The real interior, the throat and airway, stays sealed behind that valve. Crocodiles can’t actually swallow while fully submerged, though. They typically bring prey to the surface or to shallow water to tear off and swallow pieces. The valve simply lets them hold struggling prey in their jaws without any risk of drowning themselves in the process.