海牛
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1.哺(bǔ )乳(rǔ )动(dòng )物(wù ),多(duō )生(shēng )活(huó )在(zài )海(hǎi )洋(yáng )中(zhōng )。形(xíng )状(zhuàng )略(luè )像(xiàng )鲸(jīng ),前(qián )肢(zhī )像(xiàng )鳍(qí ),后(hòu )肢(zhī )已(yǐ )退(tuì )化(huà ),尾(wěi )巴(bā )圆(yuán )形(xíng ),全(quán )身(shēn )光(guāng )滑(huá )无(wú )毛(máo ),皮(pí )厚(hòu ),灰(huī )黑(hēi )色(sè ),有(yǒu )很(hěn )深(shēn )的(de )皱(zhòu )纹(wén )。以(yǐ )海(hǎi )藻(zǎo )或(huò )其(qí )他(tā )水(shuǐ )生(shēng )食(shí )物(wù )为(wéi )食(shí )。皮(pí )可(kě )以(yǐ )製(zhì )革(gé ),脂(zhī )肪(fáng )可(kě )以(yǐ )炼(liàn )油(yóu )。
2.腹(fù )足(zú )动(dòng )物(wù ),生(shēng )活(huó )在(zài )海(hǎi )洋(yáng )中(zhōng )。成(chéng )体(tǐ )无(wú )壳(ké ),体(tǐ )扁(biǎn ),椭(tuǒ )圆(yuán )形(xíng ),前(qián )端(duān )有(yǒu )触(chù )角(jiǎo )一(yī )对(duì ),呈(chéng )摺(zhé )叶(yè )状(zhuàng )。色(sè )彩(cǎi )因(yīn )种(zhǒng )而(ér )异(yì ),多(duō )数(shù )美(měi )丽(lì )。
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