How do you get Rats off an Island-Skyfall 2012

Raoul Silva : Hello, James. Welcome. Do you like the island? My grandmother had an island. Nothing to boast of. You could walk around it in an hour, but still it was, it was a paradise for us. One summer, we went for a visit and discovered the place had been infested with rats. They’d come on a fishing boat and gorged themselves on coconut. So how do you get rats off an island? Hmm? My grandmother showed me. We buried an oil drum and hinged the lid. Then we wired coconut to the lid as bait and the rats would come for the coconut and… they would fall into the drum. And after a month, you have trapped all the rats, but what do you do then? Throw the drum into the ocean? Burn it? No. You just leave it and they begin to get hungry. And one by one…
[mimics rat munching sound]
Raoul Silva : they start eating each other until there are only two left. The two survivors. And then what? Do you k**l them? No. You take them and release them into the trees, but now they don’t eat coconut anymore. Now, they only eat rat. You have changed their nature. The two survivors. This is what she made us.