"Alternative models involving colonization from adjacent land areas don’t really work for the time frame, since we know that they arrived in Fiji within the last 34 million years or so,” McGuire ...

At some point after approximately 34 million years ago, the ancestors of the Fiji iguanas arrived on the South Pacific islands.

“As soon as land appeared where Fiji now resides, these iguanas may have colonized it,” added McGuire, who is also a herpetology curator at the Museum of Vertebrate Zoology ...