In this undated photo released by DOC Image, Razza, a brown Norwegian rat, searches for food on New Zealand's uninhabited and unforested Motuhoropapa Island. The castaway rat was left to fend for himself on a deserted island in an experiment New Zealand scientists say has given them insights into why it is so hard to eradicate vermin that can seriously damage fragile island ecosystems.
(AP photo, DOC Image, HO)