This is a “Best of Wendy Langhans” Report. What exactly is a hairpencil? Is it some sort of stick-shaped hair ornament? Nope. Hairpencils are cross between (1) lighting a scented candle and (2) spreading pixie dust with a magic wand. Let me explain. Entomologists use the word “hairpencil” to describe a brush-like structure on the abdomen of some male butterflies ...
Read More »