The Smooth-head Helmeted Basilisk is a small lizard, measuring up to 11 centimeters in length, where most of this length is represented by its tail. It has the ability to change its skin color, ranging from green through brown and even black. Their skin is most normally patterned, with streaks of dark color breaking the light green overall coloration. Males have big crests on the head, while females do not posses them. Their fingers and toes are elongated. They inhabit tropical rain forests in the lowlands of Costa Rica, both in the Pacific and Caribbean sides of the country.