<b>鳥綱，Aves，是脊椎動(dòng)物亞門的一綱。體均被羽，恒溫，卵生，胚胎外有羊膜。前肢成翼，有時(shí)退化。多營飛翔生活。心臟是2心房2心室。僅保留右體動(dòng)脈弓，左體動(dòng)脈弓退化。骨多空隙，內(nèi)充氣體。呼吸器官除肺外，有輔助呼吸的氣囊。我國的鳥類分為游禽、涉禽、攀禽、陸禽、猛禽、鳴禽六大類。此六類統(tǒng)稱為鳥類的六大生態(tài)類群。全世界已發(fā)現(xiàn)有超過一萬種；中國有1400多種。</b> <p class="ql-block"> 本文收錄了一些鳥鳴的視頻，歡迎點(diǎn)擊欣賞！</p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/2jgatHY0C52DOGRaqCfTbA" target="_blank">斑鳩</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/W6d9ck4QHguh0EkMDreIRw" target="_blank"><i> </i>布谷鳥</a> <a href="https://mp.weixin.qq.com/s/3qXQ9hJ8iS05VTrRCuwzjg" target="_blank" style="font-size:18px; background-color:rgb(255, 255, 255);">1</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/8vfny71d8pR0GJC37ARH8w" target="_blank">草原林鶯</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/UeGppWdS79D9T74RGvs3dA" target="_blank"><i class="iconfont icon-iconfontlink"> </i>冬鷦鷯</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/-bLldp9VlA0g6l5vWsDPMw" target="_blank">鳳頭??</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/KjdiOwdiP5hlt3FgR7ez9A" target="_blank">畫眉</a> <a href="https://mp.weixin.qq.com/s/_pQZHZeGW2uYrfgofsuhMA" target="_blank" style="font-size:18px; background-color:rgb(255, 255, 255);">1</a></p><p class="ql-block"><a href="https://mp.weixin.qq.com/s/4s7UdX6jNkUH1II9GMZD7g" target="_blank" style="background-color:rgb(255, 255, 255); font-size:18px;">黃鸝鳥</a></p><p class="ql-block"><a href="https://mp.weixin.qq.com/s/L5HfAUXO51g4SDFzNdW7iQ" target="_blank" style="font-size:18px; background-color:rgb(255, 255, 255);">黃雀</a></p><p class="ql-block"><a href="https://mp.weixin.qq.com/s/cJDWLJdVB9f1ueAz_lPInw" target="_blank">紅子鳥</a></p><p class="ql-block"><a href="https://mp.weixin.qq.com/s/GurplRmf51YlszaBPO3xtw" target="_blank">紅麻料</a></p><p class="ql-block"><a href="https://mp.weixin.qq.com/s/7QDx0i1iIPnb22nimhAeLQ" target="_blank">紅靛頦</a></p><p class="ql-block"><a href="https://mp.weixin.qq.com/s/GoXoguI62Zt8opHPUzCoHw" target="_blank">紅頭長尾山雀</a></p><p class="ql-block"><a href="https://mp.weixin.qq.com/s/8YTJc5eHZ3MaeEIh46XsOA" target="_blank">灰冠鹟鶯</a></p><p class="ql-block"><a href="https://mp.weixin.qq.com/s/mj2nMOB69h4XXUQnLgyxkA" target="_blank">灰林鸮</a></p><p class="ql-block"><a href="https://mp.weixin.qq.com/s/BGNYPzIKO-lkcUQ4AT9DKA" target="_blank">黑頭鳾</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/heZAwoGrWap07lDNRhJqpQ" target="_blank">極北柳鶯</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/oQcwg9V_EzMEtjm0aXIWyg" target="_blank">強(qiáng)腳樹鶯</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/JHKG6bzO0a9KV3_MOsPYrw" target="_blank">日本鹡鸰</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/eLeT3vJppS0C8G7Tt6aBng" target="_blank">沙百靈</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/22exipAsWmwCh2hCULavzw" target="_blank">田雀鹀</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/maZsiOw-rMnv78p7eHbnEw" target="_blank">繡眼鳥</a></p><p class="ql-block"><a href="https://mp.weixin.qq.com/s/HKPPfrXKMcM8cocs0voFJQ" target="_blank">小熊貓鳥</a></p> <p class="ql-block"><a href="https://mp.weixin.qq.com/s/kfHtWFIMsbvMHYlZqNACPA" target="_blank">夜鶯</a> <a href="https://mp.weixin.qq.com/s/k3ZYyffKe0Rn86sicteVNQ" target="_blank" style="font-size:18px; 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