Corallus cookii

Cook's Tree Boa (Corallus cookii) or Cooke's Tree Boa is a species of tree boa endemic only to tropical forests of the island of St. Vincent. They are similar to the Amazon and Grenadian Tree Boas, only smaller in size, reaching total length at 5 feet and mainly gray or brown in color. There are only a few specimens of Corallus cookii in captivity.
See more at Wikipedia.org...