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American Robin Defends Fruit Resource against Cedar Waxwings (Petirojo (Turdus migratorius) defiende recursos alimenticios de un Bombycilla cedrorum)

Mary A. J. Pietz and Pamela J. Pietz
Journal of Field Ornithology
Vol. 58, No. 4 (Autumn, 1987), pp. 442-444
Published by: Wiley on behalf of Association of Field Ornithologists
Stable URL: http://www.jstor.org/stable/4513265
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
American Robin Defends Fruit Resource against Cedar Waxwings (Petirojo (Turdus migratorius) defiende recursos alimenticios de un Bombycilla cedrorum)
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Abstract

In central Minnesota an American Robin (Turdus migratorius) defended a fruit-bearing crabapple tree successfully against up to 15 Cedar Waxwings (Bombycilla cedrorum) during the first 2 wks of April. Defense of the tree against larger groups was unsuccessful. Such defense of fruit by birds may be more common than the literature suggests. /// En estudio que se llevó a cabo durante las primeras dos semanas de abril de 1986 en Minnesota, se observó a un petirojo (Turdus migratorius) defender de especimenes de Bombycilla cedrorum las frutas de un árbol de Pyrus sp. El ave fué exitosa en defenzas contra grupos de B. cedrorum hasta de 15 individuos. Sin embargo, no pudo defender los recursos alimenticios de grupos mayores a 30 individuos.

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