Male Java sparrows (Lonchura oryzivora) produce bill-click sounds along with their songs during courtship displays as well as when they sing to themselves when alone, has found a team of ornithologists at Hokkaido University, Japan. An adult Java sparrow (Lonchura oryzivora) in Honolulu, Hawaii. Image credit: Kim Bridges / CC BY 3.0. Birds may communicate using both vocalizations and movement, as for instance occurs during courtship displays, but...
