The aye-aye - part lemur, part rodent, the beast with the magic finger that lurks in the forests of Madagascar - is one of the world's strangest creatures. Once thought to be extinct, the aye-aye is now found only in small colonies. Gerald Durrell's task was to capture some aye-aye for breeding at his Jersey Wildlife Preservation Trust. Although on a serious scientific expedition, Durrell relates his adventures with humour.