The plumed basilisk is the largest basilisk species, with an average snout-to-vent length (SVL) of approximately 10 inches (25 cm). Including the tail, it can reach 3 feet (91 cm) in total length. Adults are brilliant green, with bright yellow eyes, and small bluish spots along the dorsal ridge. Males have three crests: one on the head, one on the back, and one on the tail, while females only have the head crest. Juveniles are less conspicuously colored, and lack the characteristic crests (Wikipedia).