Those are very cool snakes! I do have one question though; why do some boas have vertical pupils, and some with round pupils?
Beautiful boas!
All boas have vertical pupils. The difference is in the lighting at the time of the photograph. If a flash is used, there's no time for the pupil to adjust, creating the look of a round pupil because it's widened at the time. Photos of boas in sunlight all have vertical pupils because of the high amount of light.
Thanks for answering the question RobbiesCornField, I'm not sure I would have known the answer! But hey, I learned something new today!