Ledgers recording body size measurements, measuring tools and a Tennessee Warbler are pictured in this photo released on Dec. 4.
這張十二月四日發布的照片中,紀錄本上記載著鳥類體型尺寸,旁邊擺著測量工具,以及一隻田納西林鶯。Dec 15, 2019


Photo: Reuters

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