 Green iguanas are hunted by predatory birds, and their fear of these is exploited as a ploy to catch them in the wild.A hunter will imitate the sound of a hawk by whistling or screaming, causing the iguana to freeze and making it easier to capture.Green iguanas are primarily herbivores, with captives feeding on leaves such as turnip greens, mustard greens, dandelion greens, flowers, fruit, and growing shoots of upwards of 100 different species of plant.