Diets of these beetles vary from species to species .

这些甲虫喜食的食物因物种的不同而异。

How do beetles walk underwater ?

甲虫如何在水下行走？

Beetles have an impressive ability to walk underwater .

甲虫的水下行走能力着实令人惊叹。

Darwin collected fossils and beetles .

达尔文收集化石和甲虫。

3 / 16 A bowl of live water beetles .

3/16一碗活生生的水甲虫。