Adult length: about 6 ft (1.8 m); coloration: an emerald green ground color with a white irregular interrupted zigzag stripe or so-called ‘lightning bolts’ down the back and a yellow belly; juveniles vary in color between various shades of light and dark orange or brick-red; appearance: large bulky head, thin neck, stout body (can be over 2 in. in diameter) and strong prehensile tail. Pupils are vertically oriented like a cat.