Alligator, Crocodile, Iguana, and Venomous Lizard Bites By Robert A Barish, MD, MBA, University of Illinois at Chicago; Thomas Arnold, MD, Department of Emergency Medicine, LSU Health Sciences Center Shreveport Reviewed / Revised Jan 2022 | Modified Sep 2022 View Patient Education Venomous lizards, alligators and crocodiles, and iguanas can cause clinically significant bites.