Crocodile Facts | Southern Africa Wildlife Guide
- Large aquatic reptiles with a prehistoric look.
- Biologically complex with (unlike other reptiles) a cerebral cortex, a four-chambered heart and the functional equivalent of a diaphragm.
- External morphology is a sign of their aquatic and predatory lifestyle. They can swim quickly due to their streamlined body, tucking their feet into their sides to reduce water resistance.
- Webbed feet help crocodiles walk in muddy, shallow water. Webbed feet also assist them in beginning to swim in deeper waters and making quick turns and abrupt movements.
- They possess a palatal flap, which is an unyielding tissue at the back of the mouth that blocks water from entering. The palate traces a path from the nostril to the glottis that circumnavigates the mouth. A crocodile’s nostrils close when it submerges.
- The tongue has limited movement due to a special membrane, so crocodilians are unable to stick out their tongues, in contrast with the more flexible-tongued Alligatoridae.
GEOGRAPHIC RANGECrocodiles live throughout the tropics in Africa, Asia, the Americas and Australia.
HABITAT & FEEDING HABITSCrocodiles gather in watery environments such as rivers, lakes, floodplains, mangroves, estuaries and even saltwater. They eat fish, birds, reptiles
BREEDINGCrocodiles reach sexual maturity in about 10 years. Males become sexually mature when they reach 10 feet in length, while females reach sexual maturity at 6.5 to 8 feet long. The largest males are the most dominant during mating season. A male gains a female’s attention by slapping its snout on water, blasting water out of its nostrils, bellowing and making a host of other noises.
Once a female’s attention has been gained, the male and female will brush the underside of their jaws together and make a guttural warbling call. After mating, females will lay their eggs in about two months. Anywhere from 25 to 80 eggs are buried about 20 inches deep in a sandy bank. For about three months, both parents guard the nest and aggressively attack anything that comes near it. Once chirping is heard from the young, the mother digs it up for the offspring to emerge. Then, both parents take eggs in their mouths and help crack them open before taking the offspring in their mouths or leading them to water. The sex of the crocodiles is determined by the temperature during their third week of incubation.
BEHAVIORCrocodilians ambush their prey, stealthily waiting for fish or land animals such as zebra to draw near, then hastily attacking. They are
Many species of large crocodiles will ingest stones (called gastroliths) that compress and grate their food, and which aid digestion
Most crocodiles have salt glands in their tongues and a pore opening on the tongue’s surface. These tongue traits are not present in
Crocodiles can make distress calls or sounds when challenging one another. They also have ears, which are slits that flap closed when they are submerged in water. They can hear well.
Crocodiles are thought to have a homing instinct. In one case, three wandering saltwater crocodiles in Australia were transported by helicopter about 250 miles, and managed to make their way home in just three weeks, according to data retrieved from their tracking devices.
These predators can quickly move their bodies with a snake-like “belly run,” whipping their tails while splayed limbs propel them forward. In this form, a crocodile can reach speeds of 6 to 7 miles per hour—and even faster when sliding down a muddy riverbank. Crocodiles also move using a “high walk,” in which the body
Crocodiles do not possess sweat glands; they rely on their mouths to
PREDATIONCrocodiles have evolved razor-sharp teeth for grabbing hold and tearing into prey. A crocodile has forceful muscles which lock their jaws tight around a struggling animal, and they can bite down with an enormous force of more than 5,000 pounds per square inch. While they possess the most powerful bite of any creature, the muscles that open their jaws are surprisingly weak.
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