Chameleons are distinguished by their zygodactylous feet ; their separately mobile , stereoscopic eyes ; their very long , highly modified , rapidly extrudable tongues ; their swaying gait ; and crests or horns on their distinctively shaped heads .
They have parrot-like zygodactylous feet , separately mobile and stereoscopic eyes , very long tongues they can flick out , a swaying gait , their prehensile tail , crests or horns on their strange-shaped heads , and many can change color .