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The photograph on the April 2 cover of Science magazine features an image of an octopus mating captured by the late Roy Caldwell, professor emeritus of integrative biology at the University of California (UC), Berkeley. Read the tribute to Professor Caldwell in Science, contributed by Robert Full, Eileen A. Lacey, Tony Morelli, and Michael Caldwell. 

UC Berkeley News: Sunbirds suck, scientists find. Hummingbirds don't: “It’s just a really amazing example of the power and beauty of convergent evolution, where in nature we have two organisms filling the same ecological role, but when you look in detail, they’re achieving that outcome in two completely different ways,” said Rauri Bowie, UC Berkeley professor of integrative biology and a study author.