News From the Field
'Team of rivals' approach works for sparrows defending territories
February 26, 2014
A new study of territorial songs used by chipping sparrows to defend their turf reveals that males sometimes will form a "dear enemy" alliance with a weaker neighbor to prevent a stronger rival from moving in. About one time out of five, a neighboring male flew into the territory of the study male and helped him repel the simulated intruder.
University of Massachusetts Amherst
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