THE WORLD’S LARGEST bee may also be the planet’s most elusive. First discovered in 1859 by the prominent scientist Alfred Russel Wallace, nobody could locate it again, and it was presumed extinct. But Wallace’s giant bee (Megachile pluto) was not gone. In 1981, an entomologist named Adam Messer searched and found it on three islands in Indonesia, on an archipelago called the North Moluccas. He collected a specimen and wrote about his discovery in 1984. Now, for the first time, it has been photographed and filmed alive in the wild, by a team including nature photographer Clay Bolt. Meanwhile, in...