Both of the previous replies are correct. Stress will cause a boa to darken and the way a pic is taken will also effect its shade - more light will make the boa appear lighter. Other factors which will change a boa's shade include humidity (more humidity equals a darker animal), temperature, and light (my animals get lighter in bright light). Lastly, boas tend to darken after eating and females darken while gravid. And some animals will show a more dramatic change than others even from the same litter! ------------RON