Male treehoppers make their abdomens thrum like tuning forks to transmit very particular vibrating signals that travel down their legs and along leaf stems to other bugs — male and female. Courtesy of Robert Oelman hide caption

itoggle caption Courtesy of Robert Oelman

By law, all wild swans in Great Britain belong to Queen Elizabeth. Alpha/Landov hide caption

itoggle caption Alpha/Landov

Giant panda Mei Xiang, together with her cub Bao Bao at the National Zoo in 2014. As of Saturday, Bao Bao now has another sibling: Her mother just gave birth to a cub. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

African forest elephants stampede in the Central African Republic jungle. Courtesy of Cornell Lab or Ornithology hide caption

itoggle caption Courtesy of Cornell Lab or Ornithology

A pangolin is released into the wild by officials at a conservation forest in Indonesia in 2013. The animal was among 128 pangolins confiscated by customs officers from a smuggler's boat off Sumatra. Jefri Tarigan/AP hide caption

itoggle caption Jefri Tarigan/AP

Dr. Claire Guest, co-founder of Medical Detection Dogs, says one of her dogs sniffed out her own breast cancer. Janine Warwick hide caption

itoggle caption Janine Warwick

Young pigs stare out of a pen at a hog farm in North Dakota. In coming months, consumers will start to see a new label on some packages of pork: Produced "without the use of ractopamine." Will Kincaid/AP hide caption

itoggle caption Will Kincaid/AP

Common marmosets can copy the sounds and intonations of their parents. iStockphoto hide caption

itoggle caption iStockphoto

A brown bear in its natural habitat. Wildlife ecologists in Minnesota found that black bears in their study experienced an increase in heart rate when buzzed by drones. iStockphoto hide caption

itoggle caption iStockphoto