Sex selection creates distinct hummingbird species on small Jamaican island / Hummingbirds Living in a Hive Found for the First Time / New study offers insight into hummingbirds' hibernation-like rest / 'Metabolic knife edge': Study offers insight into hummingbirds' hibernation-like rest / Hummingbird flower mites found to use electroreception to hitch rides on hummingbirds between flowers