#自然头条# elephants are herbivores . as they spend 22 hours a day chewing vegetation,they need their really big,strong,ridged
Apart from two tusks (if present)、elephants have only four other teeth in a set . while people ' s teeth grow either up or down from tusks An
an elephant will have six sets of four molars in its life time . occasionally an elephant may be lucky and have seven sets .
Each time the teeth change,the new set is bigger . an elephant molar can be about 20cm long,and weigh 4kg .
if an elephant lives so long it has used up its life supply of teeth,then it may die from malnutrition .
大象是食草动物。
因为它们每天要花22个小时咀嚼植物,它们需要非常大,结实,有脊状的后牙。除了两颗象牙(如果有的话),大象一组只有四颗牙齿。人的牙齿从颚骨向上或向下生长,而大象的臼齿是从颚骨的后部生长的。每个象限都有一颗牙齿向前面移动,磨损后就会更换。
一头大象一生会有六组四颗臼齿。有时一头大象可能会很幸运,有七组。
牙齿每变一次,新牙套就变大一次。大象的臼齿大约20厘米长,4公斤重。
如果一头大象活了很长时间,用完了它的牙齿,那么它可能会死于营养不良。
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