<p class="ql-block"><b style="font-size: 22px; color: rgb(255, 138, 0);">视频</b></p> <p class="ql-block"><span style="font-size: 18px; color: rgb(255, 138, 0);">黑天鹅（学名：</span><i style="font-size: 18px; color: rgb(255, 138, 0);">Cygnus atratus</i><span style="font-size: 18px; color: rgb(255, 138, 0);">）：是</span><a href="https://baike.baidu.com/item/%E9%B8%AD%E7%A7%91/2343867" rel="noopener noreferrer" target="_blank" style="font-size: 18px; color: rgb(255, 138, 0); background-color: rgb(255, 255, 255);">鸭科</a><a href="https://baike.baidu.com/item/%E5%A4%A9%E9%B9%85%E5%B1%9E/5012824" rel="noopener noreferrer" target="_blank" style="font-size: 18px; color: rgb(255, 138, 0); background-color: rgb(255, 255, 255);">天鹅属</a><span style="font-size: 18px; color: rgb(255, 138, 0);">的一种大型游禽，体长110-140厘米；</span><a href="https://baike.baidu.com/item/%E7%BF%BC%E5%B1%95/9479928" rel="noopener noreferrer" target="_blank" style="font-size: 18px; color: rgb(255, 138, 0); background-color: rgb(255, 255, 255);">翼展</a><span style="font-size: 18px; color: rgb(255, 138, 0);">160-200厘米；体重3.7-8.75千克。具有天鹅种类中最长的脖子。这个细长的脖子通常呈“S”形拱起或直立。全身羽毛卷曲，体羽斑点闪烁，主要呈黑灰色或黑褐色，腹部为灰白色，</span><a href="https://baike.baidu.com/item/%E9%A3%9E%E7%BE%BD/35411" rel="noopener noreferrer" target="_blank" style="font-size: 18px; color: rgb(255, 138, 0); background-color: rgb(255, 255, 255);">飞羽</a><span style="font-size: 18px; color: rgb(255, 138, 0);">为白色。尾长而分叉，外侧羽端钝而上翘形似</span><a href="https://baike.baidu.com/item/%E7%AB%96%E7%90%B4/353057" rel="noopener noreferrer" target="_blank" style="font-size: 18px; color: rgb(255, 138, 0); background-color: rgb(255, 255, 255);">竖琴</a><span style="font-size: 18px; color: rgb(255, 138, 0);">。有一个明亮的蜡质的鸟喙，为红色或橘红色，靠近端部有一条白色横纹。</span><a href="https://baike.baidu.com/item/%E8%99%B9%E8%86%9C/3802949" rel="noopener noreferrer" target="_blank" style="font-size: 18px; color: rgb(255, 138, 0); background-color: rgb(255, 255, 255);">虹膜</a><span style="font-size: 18px; color: rgb(255, 138, 0);">为红色或白色，</span><a href="https://baike.baidu.com/item/%E8%B7%97%E8%B7%96/1617641" rel="noopener noreferrer" target="_blank" style="font-size: 18px; color: rgb(255, 138, 0); background-color: rgb(255, 255, 255);">跗跖</a><span style="font-size: 18px; color: rgb(255, 138, 0);">和蹼为黑色。共有2个</span><a href="https://baike.baidu.com/item/%E4%BA%9A%E7%A7%8D/6290944" rel="noopener noreferrer" target="_blank" style="font-size: 18px; color: rgb(255, 138, 0); background-color: rgb(255, 255, 255);">亚种</a><span style="font-size: 18px; color: rgb(255, 138, 0);">，指名亚种嘴较厚重。</span></p>