Lizards are reptiles. There are over 4,675 species of lizard, according to the San Diego Zoo. Others sources say there are about 6,000 species. Included in this large number are lizards with four legs, some with two legs and some with no legs at all; lizards with frills, horns or wings; and lizards in nearly every color imaginable.
Lizards generally have small heads, long bodies and long tails. With so many species of lizard, it’s understandable that they come in a wide variety of sizes. The largest lizard is the Komodo dragon. It grows up to 10 feet (3 meters) long and weighs up to 176 lbs. (80 kilograms). The smallest lizard is the tiny dwarf gecko, which grows to 0.6 inches (1.6 centimeters) long and weighs .0042 ounces (120 milligrams).
Lizards are found all over the world in almost every type of terrain. Some live in trees; others prefer to live in vegetation on the ground, while others live in deserts among rocks. For example, the Texas horned lizard is found in the warm areas with little plant cover in southern North America. The northern fence lizard, on the other hand, likes to live in cool pine forests in northern North America.
Most lizards are active during the day. Lizards are cold-blooded animals, which means they rely on their environment to help warm their bodies. They use the heat of the sun to raise their body temperatures and are active when their bodies are warm. The sun also helps lizards produce vitamin D. Their days are spent sun-bathing on rocks, hunting for food or waiting for food to come their way.
Some lizards are territorial, while others can easily live with dozens of other lizards of many different species. Other than mating times, most lizards are not social, though. There are some exceptions. For example, the desert night lizard lives in family groups, according to research by the University of California.
A lizard’s scaly skin does not grow as the animal ages. Most lizards shed their skin, or molt, in large flakes. Lizards also have the ability to break off part of their tails when a predator grabs it.
Many lizards are carnivores, which means they eat meat. A typical diet for a lizard includes ants, spiders, termites, cicadas, small mammals and even other lizards. Caiman lizards eat animals with shells, such as snails.
Other lizards are omnivores, which means they eat vegetation and meat. One example of an omnivore lizard is Clark’s spiny lizard. These lizards like fruits, leaves and vegetables.
Some lizards are herbivores and only eat plants. The marine iguana, which lives in the Galapagos Islands, eats algae from the sea. Iguanas and spiny-tailed agamids also eat plants.
Many lizards lay eggs while others bear live young. For example, frilled lizards lay eight to 23 eggs, according to National Geographic, while some skinks have live young. The gestation for a lizard egg can last up to 12 months.
Most baby lizards are self-sufficient from birth and are able to walk, run and feed on their own. The young reach maturity at 18 months to 7 years, depending on the species. Some lizards can live up to 50 years.
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Bradford, A. (2016, September 8). Facts About Lizards. Live Science. https://www.livescience.com/56017-lizard-facts.html