Paleontological studies showed that modern avian groups probably first appeared in the Paleocene and experienced an explosive radiation in the early Cenozoic. 古生物學(xué)研究表明，現生鳥(niǎo)類(lèi)的最早出現是在古新世，而爆發(fā)性輻射演化發(fā)生在新生代早期。
Paleontological studies showed that modern avian groups probably first appeared in the Paleocene and experienced an explosive radiation in the early Cenozoic. 古生物學(xué)研究表明，現生鳥(niǎo)類(lèi)的最早出現是在古新世，而爆發(fā)性輻射演化發(fā)生在新生代早期。
