Adults grow to an average of 5 and 6.5 feet (1.5–2 m) in length. Color ranges from black, brown, or gray, to any shade of red, orange, yellow, or many colors in between. Some are totally patternless, while others may be speckled, banded, or saddled with rhomboid or chevron shapes. Generally, there are two color 'phases' that are genetically inherited, but are not ontogenic as with the emerald tree boa and the green tree python. The 'garden phase' refers to boas with drab coloration, mostly brown or olive, with varied patterning, while the 'colored phase' refers to animals with combinations of red, orange, and yellow coloring.