The blunthead tree snake (Imantodes cenchoa), also known as the fiddle-string snake, is a species of rear-fanged colubrid native to
Mexico, Central America, and South America. They are arboreal, nocturnal, and
feed mostly on small lizards, frogs, and other reptile eggs. Their venom is not considered harmful to humans.
Growing to 5 feet in length, these snakes are known for their long, slender bodies and very large heads, of which their eyes make up approximately 26%.
Blunthead tree snakes have
slit-like, vertically elliptical pupils which allow them to look down. This trait is what gives the blunthead tree snake such an advantage over other snakes, which often have poor vision.