What is the third most widespread species of rat in the world, which was partially responsible for the extinction of the Kauaʻi ʻōʻō?
Kauaʻi ʻōʻō:  The causes of its extinction include the introduction of the Polynesian rat, domestic pig, and mosquitoes carrying avian disease (avian malaria and avian pox), as well as habitat destruction.
i don't know