Emerald Tree Boa, Loreto, PeruWe saw several of these brightly colored, non-venomous snakes last week. Emerald tree boas typically grow to about 6 feet in length. They have very slow metabolisms and might only eat once a month. They prefer small rodents and sometimes birds, frogs or lizards. They’ll remain in one spot for up to a week, patiently waiting for an unsuspecting meal (and making it easy for photographers to photograph them). Nikon D500 with Nikkor 500mm PF lens, ISO 800, f/5.6 at 1/125th of a second, Godox V860iii flash, off camera with Westcott soft box.