兩棲動物
兩棲動物，又叫兩棲綱，泛指所有嘅青蛙、蟾蜍、火蠑螈、蠑螈。係4千萬年前由魚類嘅祖先進化而成嘅第一隻四腳動物。佢哋亦係陸地上第一群脊椎動物。
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 花狹口蛙,Kaloula pulchra (Gray, 1831) | ||||||||||
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| Order Temnospondyli - extinct |
英文Amphibian源自希臘文（amphibious），意思係解兩種生活。
生理特性
現代嘅兩棲動物近乎冚唪唥都係住淡水嘅：兩棲動物啲皮膚有高滲透性，容易俾水或者鹽通過；佢哋一浸入鹹水，身體就會勁俾鹽入侵；跟住就會造成體內鹽嘅濃度高得滯，搞到佢哋體內嘅化學過程失衡引致死亡；所以絕大多數嘅兩棲類都頂唔順鹹水。
睇埋
攷
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