This is partly thanks to their different beak shapes.

这在一定程度上要归功于鸟喙的不同形状。

More and more beak shapes appeared from about 80 million years ago onwards.

大约 8000 万年前开始，出现了越来越多的鸟喙形状。

The beak shapes of different species of Galapagos finches played an important part in Darwin's conception of natural selection.

加拉帕戈群岛不同雀类的鸟喙形状在达尔文的自然选择学说中扮演了重要角色。

They looked at beak shape and size in almost all of the orders of modern birds and compared the beaks with other factors, such as feeding behavior and body size.

他们研究了几乎所有现代鸟类的喙形状和大小，并将喙与其他因素（例如进食行为和体型）进行了比较。