食丸（食團、食繭）是鳥類吐出的未經消化的食物。[1]除猛禽外其他鳥類亦可產生食丸。[1]食丸一般包含硬質、難以消化的相對低營養物質，包括骨骼、喙、爪、牙齒、昆蟲頭部、種子外殼等。[1]上述硬質殘渣通常被毛髮、羽毛、植物纖維等軟質殘渣包裹。[1]上述未經消化的食物在砂囊中聚積並壓實成球形或卵形，最終被鳥吐出。[2]大多數鳥一天吐出一到兩個食丸。[2]
可通過分析食丸的組成部分了解鳥類獵物。[1]亦可通過分析食丸特徵鑑定鳥類物種。[2]
參考文獻
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