They introduced a fly to save Fiji's coconuts—then an entire species vanished

The introduction of a species of invasive flies to Fiji as a means of pest control has turned out to be one such example, which now serves as a warning in conservation studies. Since the Fijian authorities cooked their own goose by trying to conserve their coconut plantations by introducing the parasitic flies, they ended up making the native species of insects extinct.

Raccontata datimesofindia.indiatimes.com