有耳羽的貓頭鷹警戒時會豎起頭頂的耳羽，在貓頭鷹呈現僵直狀態下尤其明顯，耳羽是否被具備強化偽裝的效果，過去並未被驗證。本研究探討僵直下的領角鴞(Otus lettia)，豎起耳羽能否進一步降低被鳥類滋擾的機率及延遲被鳥類發現的時間。2016年六至十月間，將正常姿勢有耳羽、正常姿勢無耳羽、僵直姿勢有耳羽、僵直姿勢無耳羽等四種領角鴞標本，架設於30個樣點並以行車紀錄器早上連續記錄四小時的鳥類群聚滋擾行為。結果顯示僵直姿勢標本顯著地降低被滋擾的次數和被發現時間，豎起耳羽時被滋擾的次數又更低一些但並未顯著。不同鳥種出現滋擾的模式不一，實驗初期的滋擾頻度較高，可能和繁殖或鳥類習慣於標本有關。

On guard, an owl with ear tufts would have the tufts erected, and they look obvious when an owl is under a concealing posture, i.e. becoming slimmer and taller. However, it has never been tested whether tufts could enhance the concealment effect. During June-October 2016 I set up four types of Collared Scops Owl (Otus lettia) specimens-normal posture with/without tufts and concealing posture with/ without tufts-at 30 different spots and recorded four consecutive hours in the morning using dashcams to document mobbing event. Study showed the concealing posture did lower mobbing rate and postpone the detection time. However, tufts didn’t significantly make the camouflage effect better. The mobbing pattern varied with bird species. Mobbing was more intense in earlier period of experiment, which may be due to breeding activity or habituation to the specimens.

目錄
摘要................................................I
Abstract...........................................II
謝誌..............................................III
目錄..............................................IV
圖表目錄...........................................VI
壹、前言............................................1
貳、文獻回顧........................................4
一、鳥類的群聚滋擾行為..........................4
二、群聚滋擾行為對貓頭鷹的影響..................7
三、貓頭鷹的保護色..............................8
(一)僵直姿勢.................................9
(二)耳羽.....................................9
參、材料與方法.....................................12
一、研究樣區...................................12
二、研究方法...................................14
三、影像分析...................................14
四、鳥類群聚滋擾行為的分析.....................15
肆、結果...........................................17
一、耳羽及僵直姿勢與鳥類的滋擾次數.............17
二、耳羽及僵直姿勢與開始被鳥類滋擾的時間.......17
伍、討論...........................................27
一、耳羽及僵直姿勢與鳥類的群聚滋擾行為.........27
二、鳥類群聚滋擾行為的探討.....................28
陸、結論...........................................32
柒、參考文獻.......................................33
附錄一、各屬貓頭鷹中有無耳羽的物種數...............42
附錄二、各屬貓頭鷹的耳羽型態.......................43
附錄三、四種姿勢的領角鴞標本.......................44
附錄四、領角鴞標本實際架設狀況與行車紀錄器之架設...44
附錄五、鳥類滋擾領角鴞標本照片.....................46
附錄六、各種鳥類的群聚滋擾聲.......................47
作者簡介.......................................48

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