Seasonal changes in digestive enzymes in five bird species

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Keywords
Passerine, Diet, Digestive enzymes, Birds, SeasonalChanges, Zonotrichia capensis, Carduelis barbata, Diuca diuca, Phrygilus fruticeti, Leptasthenura aegithaloides, Rufous-collared sparrow, Black-chinned siskin, Common diuca finch, Mourning sierra finch, Plain-mantled tit-spinetail
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