21. During the summer months, the island becomes a breeding site for terns and tree snakes , geckos and skinks. 22. The introduction of the brown tree snake into Guam has resulted in extinction of twelve native bird species in total. 23. Natural predators include green tree snake and the copperhead snake, are also believed to be predators of the frog. 24. It makes loud noises, eats native bugs, and is a potential food source for the brown tree snake . 25. Blunthead tree snakes on the other hand, have vertical slits for pupils which allow for the snake to look down. 26. Generally, however, tree snakes in the wild will make a quick escape when they realize someone is watching them. 27. Overall, the vertebrate fauna and native flora of Guam have suffered tremendously because of the introduction of the brown tree snake . 28. Blunthead tree snakes are distributed in Mexico, most of Central America, and parts of South America south to northernmost Argentina. 29. Before leaping, Tree Snakes hang the uncoiled forepart of their body off the branch in a " like a J ". 30. Brown tree snakes are constrictors with evil-looking vertical pupils, rear fangs and mildly venomous saliva and a disproportionately large head.
