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Independent discoveries of a new, apparently homologous call in the Willow Tit Parus montanus and Black-capped Chickadee Parus atricapillus |
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| Authors: | SVEIN HAFTORN WEI-CHING HUANG CORTLAND K GRISWOLD JACK P HAILMAN |
| Institution: | Norwegian University of Science and Technology, The Museum, N-7004 Trondheim, Norway;Department of Zoology, University of Wisconsin, Madison, WI 53706, USA |
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