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Boa constrictor
The family Pythonidae is not found in the Americas. There is a possible relative of the pythons from the Australian/New Guinean region (Morelia and Aspidites), Loxocemus bicolor, but this spotting does not in any way resemble it. So I am interested in the answer to Sean's question too!
Its a Python but sure which one. Try Burmese Python? Was this in the Zoo or Wild? it will help with the ID