These changes, which gave birds greater facility for flight, made them more effective predators. It’s not difficult to imagine that they feasted on giant insects.这些变化明显增强了鸟类的飞行能力,进而提高了它们的捕食效率。不难想象,他们开始将大型昆虫作为猎捕目标。 http://www.kekenet.com/Article/201706/513506.shtml