These were all over in the Cancun area resort I was at recently.
Largest I saw was 4' + from head to tail.
Gray with blackish gray banding, in the shape of inverted triangles (sort of) more noticeable on the tail.
Seems that the bigger ones had more iguana like spines, and I'm pretty sure had the typical circle scale on the jowles, but I'll have to finish going through my CF cards and find some more examples later.
Thanks for helping my curiousity.
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