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 E-Mail IMAGE: This portrait shows the tritylodontid Fossiomanus sinensis (upper right) and the eutriconodontan Jueconodon cheni in burrows; both lived the Early Cretaceous Jehol Biota (about 120 million years ago), northeastern China,. view more  Credit: © Chuang Zhao Paleontologists have discovered two new species of mammal-like, burrowing animals that lived about 120 million years ago in what is now northeastern China. The new species, described today in the journal Nature, are distantly related but independently evolved traits to support their digging lifestyle. They represent the first scratch-diggers discovered in this ecosystem. There are many hypotheses about why animals dig into the soil and live underground, said lead author Jin Meng, a curator in the American Museum of Natural History s Division of Paleontology. For protection against predators, to maintain a temperature that s relatively constant not too hot in the summer and not too cold in the win

Fangyuan maoJin mengChi zhangCunyu liuAmerican museum of natural historyNational natural science foundation of chinaBeipiao pterosaur museum of chinaYoung talents programChinese academy of sceincesChinese academy of sciencesYouth innovation promotion associationAmerican museumNatural historyJehol biotaEarly cretaceousChinese academy