Chameleons are solitary animals and only like to interact with other chameleons when it's time to reproduce. Gathering in groups can stress them out, so naturally a group of chameleons is called a "stress."

The Parson's chameleon (Calumma parsonii) can weigh upwards of 700 g (1.5 lb) at maturity, and is usually considered the largest by weight, although it is shorter than the Malagasy giant chameleon which holds the title for the largest by length.

When it comes to nabbing insects, a chameleon's tongue is the envy of the lizard world. But even that sticky organ can only reach so far, so chameleons sometimes wipe their jaws against tree branches, smearing a foul, waxy material that smells like rotting meat on the bark to attract prey.

Certain species of chameleons have bones that glow under ultraviolet light, also known as biogenic fluorescence. Some 31 different species of Calumma chameleons, all native to Madagascar, displayed this fluorescence in CT scans. The bones emitted a bright blue glow and could even shine through the chameleon's four layers of skin.