Chameleon

A chameleon is a special kind of lizard.

They can change their skin color. Some turn bright red or blue. Others turn brown to hide. This helps them stay safe.

They use their color to talk. They also use it to stay warm. A dark color can soak up heat. A light color can reflect heat.

These lizards have very cool eyes. Each eye can move on its own. They can look in two directions at once!

Their tails are like a fifth limb. They use them to hold onto branches.

Chameleons are truly amazing animals.

Chameleons are a special group of lizards.

Most live in Africa. Many also live in Madagascar. Some live in Asia and Europe.

These lizards have many cool parts. They have a prehensile tail. This means the tail can grip things like a hand. They use it as a fifth limb to stay steady in trees.

Their eyes are also special. Each eye can move on its own. This lets the brain see two different views at once. When they hunt, both eyes look forward to see clearly.

Chameleons are famous for changing color. They do this for many reasons. They use color to hide from predators. They also use color to talk to other chameleons.

Color helps them show if they are angry or shy.

They even change color to stay warm. Chameleons are ectothermic. This means they use the sun to change their body heat. A dark color soaks up heat. A light color reflects heat away. This helps them stay at the right temperature.

Inside their skin, tiny crystals change how light bounces off them. This creates new colors.

Chameleons are a very special group of lizards.

They belong to a family called Chamaeleonidae. There are about 200 different species of these lizards. Most of them live in Africa. About half of all species live on the island of Madagascar. You can also find some in southern Asia and Europe. Some have even been moved to Hawaii and Florida. They are famous for being able to change their colors.

This helps them hide or talk to other lizards.

Changing color is a very cool way they work.

Their skin has a top layer with pigments. Under that layer, they have special cells called iridophores. These cells hold tiny guanine nanocrystals. The chameleon can change the spacing between these crystals. When the crystals are close together, the skin looks blue or green. When the lizard moves them further apart, the skin reflects longer wavelengths. This makes the skin look yellow, orange, or red. They also use color to control their body heat. Dark colors soak up heat from the sun. Light colors reflect heat away to keep them cool.

Scientists have studied these lizards for a long time.

The name chameleon comes from the Greek words for "on the ground" and "lion." We have found fossils of very old lizards that look like chameleons. One fossil called Anqingosaurus brevicephalus is from China. It lived about 58 to 61 million years ago. Another fossil called Chamaeleo caroliquarti was found in Europe. These fossils show that chameleons have been around for a very long time. They likely shared an ancestor with other lizards over 100 million years ago.

Chameleons have many unique body parts.

Most have a prehensile tail. This means the tail can wrap around branches like a hand. They often use it as a "fifth limb" to stay steady. Their feet are zygodactylous, which helps them grip twigs. Their eyes can move in different directions at the same time. This allows the brain to see two separate images at once. When they hunt, both eyes focus forward together. This gives them stereoscopic vision to see prey clearly. Some species even have horns or crests on their heads.

You can think of a chameleon like a living mood ring.

Just as a ring might change color, a chameleon changes to show feelings. They show bright colors when they are being aggressive. They show darker colors when they want to give up. Their colors also depend on where they live. Chameleons in green forests have many bright colors. Chameleons in dry deserts often stay brown or charred. This helps them match the world around them. They are masters of using light and color to survive.

Chameleons are a highly specialized group of lizards within the family Chamaeleonidae. As of June 2015, scientists had described approximately 200 different species. These reptiles are famous for their ability to change color for many reasons. They use these shifts for camouflage, social signaling, and temperature control. Most species are arboreal, meaning they live in trees and bushes. However, some species live on the ground.

The mechanism behind their color change is a complex biological process. Chameleon skin has a superficial layer containing pigments. Beneath this layer are specialized cells called iridophores. These cells contain a lattice of tiny guanine nanocrystals. The chameleon can actively tune the photonic response of these nanocrystals. By changing the spacing between the crystals, the lizard alters how light reflects. When the crystals are close together, they reflect shorter wavelengths like blue and green. When the spacing increases, the skin reflects longer wavelengths like yellow, orange, and red.

Chameleons use these color shifts for several vital functions. Because they are ectothermic, they must regulate their body temperature using the environment. A chameleon might turn a darker color to absorb more light and heat. Conversely, it may turn a lighter color to reflect heat and stay cool. Color also serves as a way to communicate with others. Bright colors often signal aggression toward other chameleons. Darker colors can indicate that a chameleon is submitting or "giving up."

Physical adaptations make chameleons very distinct from other lizards. Most species possess a prehensile tail, which acts like a "fifth limb" for anchoring. Their feet are zygodactylous, a specialized structure for gripping branches. Their eyes are also unique because they are independently mobile. This means the brain must constantly analyze two separate images of the environment. When hunting, the eyes coordinate to focus forward. This provides stereoscopic vision, which helps them target prey accurately.

The history of these animals stretches back millions of years. The oldest described chameleon fossil is Anqingosaurus brevicephalus from China. This fossil dates to the Middle Paleocene, roughly 58.7 to 61.7 million years ago. Other fossils include Chamaeleo caroliquarti from the Miocene epoch in Europe. Scientists believe chameleons may share a common ancestor with iguanids and agamids from over 100 million years ago. While many species live in Madagascar, research suggests they likely originated in mainland Africa.

Geography plays a major role in how chameleon species look. Chameleons living in lush rainforests often have a very colorful palette. In contrast, species in deserts or savannas usually have simpler brown or charred colors. Some species even adjust their camouflage based on the specific vision of a predator. For example, they may change colors to better hide from birds or snakes. This shows how deeply their appearance is tied to their specific environment.

Classification of the family has changed as science has progressed. In 1986, the family was divided into two subfamilies: Brookesiinae and Chamaeleoninae. This division was based on different groups of genera. However, many scientists later debated whether this was the correct way to group them. Some researchers eventually abandoned the subfamily division entirely. In 2015, researcher Glaw proposed a new division. He placed the genera Brookesia and Palleon in Brookesiinae and others in Chamaeleoninae.