Male Jackson’s chameleons turn yellow to attract females or to signal their dominance to other males. With fewer predators around, the Hawaiian population has evolved a brighter hue
In 1972, about 36 Jackson’s chameleons were imported from Kenya by a pet shop owner in Hawaii. He placed them in his back garden, but they escaped. Since Hawaii has few animals that can prey on them, they were able to establish themselves widely.at Macquarie University in Sydney, Australia, and his colleagues wondered whether being released from this predation pressure led to changes in the chameleon’s colour displays.
When exposed to the bird and snake models, both groups changed colour to blend in to their environment, but the Hawaiian chameleons did this less effectively.
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