Animals can navigate by starlight. Here’s how we know.
“No, no, no, no, Brian. No, no, no, no.” I had asked Stephen Emlen, a Cornell emeritus professor of neurobiology and behavior, what seemed to me an obvious question: When he brought birds into planetariums in the 1960s and 70s, did they ever, um, make a mess in there? “No poops in the planetarium,” Emlen […]