How the ‘Monstrous’ Iguanas of the Bahamas Got So Darn Big

Several islands in the Bahamas are home to the same species of iguana, the endangered Allen Cays rock iguana. The species only came to Allen Cay in the 1990s, but for some reason, the iguanas on Allen Cay are enormous, compared to their cousins on U Cay, Leaf Cay, and the other islands they inhabit. Biology professor John Iverson wanted to find out why they became so big in a relatively short span of time. It had to be something special about the environment of Allen Cay.

He puzzled over...

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