Viewing animals like shares reveals vanishing species

By Peter Aldhous and Debora Mackenzie THE world’s mammals are in crisis, with about 1 in 5 species threatened with extinction. That is the bleak headline news from the latest revision of the IUCN Red List of Threatened Species, released on 6 October. But one bright spot in this gloomy picture is that biologists have acquired a powerful new tool for discovering whether other groups of plants and animals are faring any better. Called the Sampled Red List Index,
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