Ostensibly, Roger’s World is an account of Charles Siebert’s whistle-stop tour of primate retirement homes in America. By the author’s reckoning, there are approximately two to three thousand chimpanzees in America, as well as a substantial number of their primate cousins. He travels across the country, visiting captive chimpanzees on an ‘impromptu farewell tour of our own kidnapped and caged primal selves’, until he encounters Roger, with whom he feels a profound connection.

If one is inclined to accept the disturbing idea of retirement homes for chimpanzees as only possible in America, Siebert’s final night with Roger, at the Center for Great Apes in Wauchula, Florida, forces a reassessment of such easy presumptions. The hours of silence between man and ape lead to an exploration of the broader context of humanity’s relationship with animals. Siebert laments a wildlife ‘endgame’ in which he insists that hundreds of animals are damaged and diseased in the name of research, and entire species exposed to nervous distress due to human activities. This leads him to the discomfiting conclusion that if we ever figure out how to talk to the animals, there may be none (bar those we have already captured and irreparably damaged) left to answer.