同第啲兜蟲一樣,獨角仙公乸明顯唔同樣:公同乸嘅成蟲最樣眼嘅分別係,獨角仙公嘅頭前方有兩隻角,一大一細,兩隻都分叉,當中大啲嗰隻會成 Y 字噉形;喺夏天(交配季節)嗰陣,啲獨角仙公會用佢哋嘅角嚟玩相撲,嘗試用力量制服對手,一嘢撬到對手飛起,而打贏咗嘅公就會得到地盤;除此之外,一隻獨角仙公隻角大,反映咗佢喺幼蟲階段嗰時得到良好嘅營養-啲乸會偏好同角大又強壯(爭到地盤)嘅公交配。
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