Ctenosaura similis, commonly known as the black iguana or black spiny-tailed iguana, is an iguanid lizard native to Mexico and Central America. It has been reported in some Colombian islands in the Caribbean Sea and Pacific Ocean, and has been introduced to the United States in the state of Florida. The largest species in the genus Ctenosaura, it is commonly found in areas such as grasslands and forests.

This Black Spiny-tailed Iguana was photographed at Cozumel, Mexico on February 20, 2026. View all Black Spiny-tailed Iguana photos →