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Guest editor, the architect David Adjaye designed the Mass Extinction Monitoring Observatory, a stone spiral rising above on Dorset's Jurassic Coast. We took a closer look at three of the hundreds of extinct species it will showcase.

Elizabeth Kolbert, author of the Sixth Extinction, profiles the white rhino, a species which is vulnerable to poachers because of its prized horns.

The northern white rhino are on the brink of extinction; only three remain in a zoo in Kenya. The southern white rhino, however, is "one of the great conservation success stories of the twentieth century". While the population had dwindled to two figures at the beginning of the century. At the latest count in 2012, there were over 20,000.