I’ve been thinking about chimps lately. I called them a “who” and not a “which” in a recent piece I produced for the American Museum of Natural History. This earned me a virtual slap by my copy editor. As in:

“Chimpanzees, who WHICH are not bipedal…”

I was just giving a nod to a fellow hominid—the taxonomic group that includes chimpanzees, gorillas, orangutans, and humans. Pan troglodytes are 99.8% genetically similar to us, making them our closest living relative.