These stories are sad.

"the introduction of the Indian Mongoose (to Hawaii) has been a disaster of epic proportions. Mongooses do kill rats, but not the numbers needed to justify their use. Unlike the nocturnal rats, the mongoose is active during the day. So instead of ridding the islands of rats, the mongooses have found many other things to eat instead. Their diet is surprisingly varied. In fact, it appears there's very few things that a mongoose won't eat"

NATURALLY SPEAKING: The Mongoose: A Maui Menace