How to distinguish an animal from an insect?

Some animals we think are insects, but they are not insects.

First, insects, such as frogs, lizards and snakes, are not necessarily insects beside the word “worm”.

2. Small bodies are not necessarily insects. For example, snails and earthworms are not insects.

3. Many feet are not necessarily insects, such as spiders and centipedes are not insects.

Identification of Insects

Insects have been on the planet for more than 300 million years, earlier than the dinosaurs of the Jurassic era, and the common cockroaches in our homes are one of the earliest discovered insects by biologists. The species and number of insects are very large, and they have four main characteristics:

1. Having six feet:

This is the fastest identification method with high accuracy; butterflies have three pairs of feet and are one of the common insects.

2. The body is divided into three parts: head, chest and abdomen.

In adult insects, the body obviously has three parts: head, chest and abdomen, and three pairs of feet grow in the chest. Ants are “typical” insects.

The body of an ant has three parts: head, chest and abdomen.

The body of an ant has three parts: head, chest and abdomen.

3. There is no vertebra in the body:

Insects belong to invertebrates, and their bodies are mainly protected by exoskeletons formed by chitin, so they are not easy to decay during adult stage, which is why insects are easy to make specimens.

Insects have a chitinous shell

Insects have a chitinous shell

4. Having compound eyes:

Most insects have “compound eyes” besides one eye. Each compound eye is arranged by many small hexagonal eyes. The more the number, the better the vision and the wider the field of vision.