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ALVARADO S & RA FIGUEROA (2006) Unusual observation of Three Red-backed hawks (Buteo polyosoma) defending a nest. Journal of Raptor Research 40: 248-249 doi: 10.3356/0892-1016(2006)40[248:UOOTRH]2.0.CO;2.
https://doi.org/10.3356/0892-1016(2006)40[248:UOOTRH]2.0.CO;2Abstract
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