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PDF Availablehttps://doi.org/10.1080/00063657409476407
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Cite Journal: Bird Study |  Publication Date: Jun 1, 1974 |
 Citations: 18 |
Both year-old and adult Magpies defend territories in the spring, and in some areas nearly half the spring population consists of non-breeders. Their strong competitiveness at this time may be the primary cause of the peak mortality shown by recoveries of ringed birds.
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