1·DNA hybridization techniques have been widely used in aves, based on which a new avian classification system was born.
DNA杂交技术曾在鸟类中有过大规模的应用，并由此诞生了一套新的鸟类分类系统。
2·It is well known that modern aves lack dentition unlike their toothed ancestors of the Jurassic and cretaceous periods.
众所周知现代鸟类不长牙齿，而其侏罗纪和白垩纪的祖先则长有牙齿。
3·It is well known that modern Aves lack dentition, unlike their toothed ancestors of the Jurassic and cretaceous periods.
众所周知现代鸟类不长牙齿，而其侏罗纪和白垩纪的祖先则长有牙齿。