ruby-crowned kinglet Directory References Images Discover Why Do Languages Die? Nostradamus and His Prophecies What If the President Is Impeached? Timeline of the American Civil Rights Movement Why Are Some Time Zones 30 Minutes Off Instead of an Hour? All 119 References in “We Didn’t Start the Fire,” Explained 7 Puzzling Plane Disappearances Contents ruby-crowned kinglet bird Ask the Chatbot a Question Ask the Chatbot a Question Also known as: Regulus calendula Learn about this topic in these articles:description In kingletIn the ruby-crowned kinglet (R. calendula) of North America, the crown mark is a mere tick of red, appearing on the male only and usually concealed.Read More