Home / Science / Centuries-Old Reptiles Vindicated: Clarion Island Iguanas Predate Human Arrival by Millennia
Centuries-Old Reptiles Vindicated: Clarion Island Iguanas Predate Human Arrival by Millennia
10 Nov, 2025
Summary
- Iguanas on Clarion Island in Mexico were thought to be invasive, but DNA evidence proves they arrived 425,600 years ago
- Iguanas made a 700-mile rafting journey to reach the island, the second-longest known aquatic journey for iguanas
- Eradication plans for the iguanas were halted after the discovery of their native status

In a remarkable discovery, biologists have determined that iguanas living on Clarion Island, a remote Mexican island in the Pacific Ocean, are actually native to the region and not an invasive species as previously believed. The research, published last month, shows that the spiny-tailed iguanas have been present on the island for around 425,600 years, long before any human presence.



