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He caught thousands of individual lizards on the island, tagged them, and measured their body proportions. Stroud then re-caught all of the lizards on the island every six months for 2 ½ years, a period of time representing two to three generations of lizards. “What is special about this study is that we simultaneously measured natural selection on four co-existing species, something that has rarely been accomplished,” said Losos, who also serves as the director of the. “By coincidence, just as our paper was published, another group published a similar study on Darwin’s famous finches of the Galapagos Islands.