This muzzled dog, Lassie, belonged to early conservationist Richard Henry. In the late 1890s Lassie sniffed out hundreds of kiwi and kākāpō in the rugged mountains of Fiordland. Henry then moved the birds to Resolution Island, which was free of stoats. But later, stoats managed to swim across from the mainland, and killed his beloved birds. Although the scheme failed, the idea of a safe island has survived, and today predator-free islands are a conservation success story.