ScienceDaily Posted February 12, 2013 Share Posted February 12, 2013 Territorial song sparrows use increasingly threatening signals to ward off trespassing rivals. First an early warning that matches the intruder's song, then wing waving -- a bird's version of "flipping the bird" -- as the dispute heats up, and finally, if all other signals have failed, attack. Read the full article on ScienceDaily Link to comment Share on other sites More sharing options...
PhysOrg Posted February 12, 2013 Author Share Posted February 12, 2013 Territorial song sparrows use increasingly threatening signals to ward off trespassing rivals. First an early warning that matches the intruder's song, then wing waving – a bird's version of "flipping the bird" – as the dispute heats up, and finally, if all other signals have failed, attack. Read the full article on PhysOrg Link to comment Share on other sites More sharing options...
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