Spiders sing the blues
Tarantulas evolved a blue hue at least eight times, but scientists aren’t yet sure what purpose the coloration serves, Susan Milius wrote in “Tarantula blue is no accident” (SN: 1/9/16, p. 4). In the article, spider researcher Bor-Kai Hsiung wonders if, for example, the blue might scare away predators or attract insects.
More than one reader wanted to know whether tarantulas are diurnal, a clue that might help researchers narrow in on the significance of the coloration. In a paper reporting their findings, Hsiung and his colleagues wrote that tarantulas are