Male panther chameleons can grow to 21 inches in length but are typically smaller at 12 to 18 inches. Females grow to be about 12 to 14 inches long. Males usually weigh between 140 and 180 grams.

However, only adult male chameleons change color, especially when they see a rival male chameleon they want to chase away, or a female to attract, Milinkovitch said.

Male chameleons have a special layer of cells within their skin that helps them change color when they want to intimidate a rival or woo a female.

Male nano-chameleons may need such large sex organs, the study authors said, because they're smaller than their female counterparts. The female nano-chameleon they found measured about 1.1 inches ...

A male and a female Decary's leaf chameleon, Brookesia decaryi. Most chameleons have skin that already resembles their environment, but they can adjust the brightness of the hue in varioius ways.

Male chameleons tend to fight amongst each other more often than females do, though no matter what the gender, chameleons require a safe and private location to retreat to every day.

When male chameleons challenge each other for territory or a female, their coloring becomes brighter and much more intense. Males that display brighter stripes when they are aggressive are more ...

The male "nano-chameleon" is less than an inch in length, researchers found, significantly smaller than the female. In order to reproduce, he has to compensate in other ways.

This flashy male chameleon is deadly beautiful to his competitors. Photo by Megan Best. Flashy feathers and extravagant fur are the Ferraris and Rolex watches of the animal kingdom.

Color-morphing may sound less intimidating than, say, baring teeth or dragging hooves, but male chameleons rely on such psychedelic intimidation to ward off male rivals, according to a new study.

The male chameleons wear a cheery green look, but the females are the stars of the show. They sport exotic patterns flecked with bright colors, including shades of blue, red, ...