Mexican vine snake
The Mexican vine snake does a very good job of imitating a branch or vine, at least until it realizes that it's been seen!
This species reaches 5 feet in length and eats frogs, birds and lizards. It's slightly venomous, but not enough to be dangerous to people. In spite of its name, it's found all the way from Arizona down to South America. Most arboreal snakes are green and live in rainforests, but the Mexican vine snake is brown because it lives in drier forests, where its color matches the surroundings better.
Photograph by Richard Seaman
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Other Belizean "Pictures of the Day":
San Pedro Daily, Tony Rath's "Images of Belize"