堤上贝壳种类丰富，多为潮间带或浅海泥沙海底软体动物的现生种属。
Embankment shell variety, mostly for the intertidal zone or shallow seabed sediment mollusc species present health.
古生物学研究表明，现生鸟类的最早出现是在古新世，而爆发性辐射演化发生在新生代早期。
Paleontological studies show that modern avian groups probably first appeared in the Paleocene and experienced an explosive radiation in the early Cenozoic.
他们的结果证明，在现生哺乳类中，鲸豚与偶蹄类最亲近；骆驼、河马、猪及牛羊等反刍动物都属于偶蹄类。
Experts agree that hippos belong to the mammalian order artiodactyla, a group of even - toed, hoofed creatures whose extant representatives include camels, pigs and ruminants such as cows.
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