Snakes of Belize book
is a great one .
Richie Woods once published a book on Ambergris Cayes flora and Fauna. In the book he said Ambergris Caye had no poisons snakes. I believe a Real Estate agent may have given him $100. to print that.
We definitely have coral snakes and its cousin the fake coral snake. 5 years ago I killed a Yellow Jaw Tommygof Ferdalance at Mata Grande only one I've ever seen on the Island. and I'm sure I didn't spell that right.

White Sands Dive Shop
https://whitesandsdiveshop.com/