The Amazon region is frequented by the giboia (boa constrictor), and the central plateau by the sucurid (Eunectes murinus), both distinguished for their enormous size.
Among the non-venomous species, the commonest are the boa-constrictor, the anaconda (Eunectes murinus) and the ih'.
Constrictor in the United States.
The blow snake, or spreading adder (Heterodon platyrrhinus), black snake (Bascanion constrictor), coach whip (Bascanion flagellum), and prairie bull snake (Pituophis) are common; the diamond water snake (Natrix fasciata) is found along creeks; the king snake (Lampropeltis getula), in central and southern Texas; and the pilot snake (Callopeltis obsoletus), mostly in the woods of McLennan county.
The ophidians are also very numerous, ranging from the comparatively harmless boa-constrictor to the deadly " palanca " or " fer de lance " (Lachesis lanceolatus) and rattlesnake (Crotalus), of which there are several species.
Squirrels, flying-squirrels, porcupines, civet-cats, rats, bats, flying-foxes and lizards are found in great variety; snakes of various kinds, from the boa-constrictor downward, are abundant, while the forests swarm with tree-leeches, and the marshes with horse-leeches and frogs.
This is an enormous boa-constrictor of great length and weight, which drops upon his prey from the branch of a tree, or steals upon it in the thick grass.
Serpents, especially the boa-constrictor, are numerous.