Alan Boyle writes: Conservationists are celebrating the discovery of more than 200 new species in the remote mountains of Papua New Guinea, ranging from flowers to frogs to mice.

The island of New Guinea and its surroundings have been a biological gold mine for more than a century, going back to the expeditions of Alfred Russel Wallace, a pioneer in evolutionary biology and contemporary of Charles Darwin who cataloged hundreds of species throughout the Malay Archipelago.