Frogs are amphibians. They can move on land and sometimes in farmland as adults. Frogs' main food is smaller animals. Because frogs have special eye structure and can only see moving animals, they will directly prey on some live animals. There are many animals that frogs can eat, among which the most important one is insects, that is, animals in the class Insecta.

Among these insects, many are pests, which will stay on crops planted by human beings, eat the leaves, fruits or suck their sap, and do great harm to these crops. Frogs can eliminate these pests, so they are good for human beings, and can protect human crops and ensure the yield. Moreover, frogs have a strong ability to eat pests. A frog can eat dozens of insects every day, and the number of pests that can be eaten in one year is very considerable.

Frogs have a strong ability to eat pests and can eat many pests every day. Frogs eat more kinds of pests. Many of them are pests in Lepidoptera, such as rice leaf rollers and rice borer which can harm rice, corn borer which can harm corn, cotton bollworm which can harm cotton, armyworm and Spodoptera exigua which can harm other crops, and so on. In addition to the largest number of Lepidoptera, there are also insects in Coleoptera, such as rice weevils, rice mud insects, ladybugs and so on. In addition, there are some insects in Hemiptera and Diptera, such as gray-backed planthopper, white-backed planthopper, fruit fly, mosquito and so on. In a word, there are many kinds of pests that frogs can eat, which are beneficial to human beings.