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'Get off my lawn:' Song sparrows escalate territorial threats

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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.pB6vZEul1JY

 

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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

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