How do dragonflies see with compound eyes?

Dragonflies have compound eyes because they need to see their surroundings so that they can catch their prey. Its compound eyes are composed of many small eyes, each of which can only see a part of the object, and many small eyes can be combined to see the object clearly. The human eye needs seconds to see the outline of an object, while it only needs seconds to see clearly, so that it can catch moving prey.

The dragonfly's two large compound eyes are also incomparable among insects. There are a total of 20,000 compound eyes, and even about 28,000 small eyes, which are 10 times the compound eyes of ordinary insects. The structure of its eyes is also very peculiar, with a small eye in the upper part of the compound eye, which is dedicated to seeing distant objects; The lower part of the eye is dedicated to looking close.

Each small eye of the compound eye can form an image point, and these image points are put together to form the image they see.

Of all the insects, dragonflies have the largest compound eyes, bulging on either side of the head, accounting for more than two-thirds of the total area of the head, and consisting of 28,000 small eye faces. The scene seen by the dragonfly compound eye is that each small eye of the compound eye can form an image point, and these image points are put together to form the image they see.

The role of the compound eye of insects:

1. The vast majority of insects have monocular and compound eyes on their heads, generally with 1 pair of compound eyes, and sometimes 3 monoceals. They are the main visual organs and play an important role in the activities of insects such as feeding, growing and reproducing.

2. The function of the compound eye is to be able to image, and each small eye only forms a part of the picture of the object, and the image of the whole object is pieced together by each small eye. The larger the volume of the compound eyes, the greater the number of small eye faces, and the stronger their vision. Conversely, the smaller the volume of the compound eye, the weaker the visual acuity.

The reflected light emitted by the object enters the dragonfly's compound eye.

The compound eye of the dragonfly is composed of some small eyes, less than five or six, more than tens of thousands, the reflected light emitted by the object enters the compound eye of the dragonfly, and the light source information enters the visual center to form a light point image, which is the last image that the dragonfly sees.

Appearance characteristics of dragonflies:

1. Dragonfly wings are well developed, the front and rear wings are equal and narrow, membranous, the reticulated wing veins are extremely clear, and the flight ability is very strong, up to 10 meters per second, which can suddenly turn around, and can go straight into the sky, and sometimes can fly backwards. When resting, spread your wings flat on your sides or stand upright on your back. The forewings and hindwings are not similar, and the hindwings are often larger than the forewings.

The anterior edge of the wing, near the apex of the wing, each has a wing nevus, which is rectangular or square, which maintains the regularity of the wing vibration and prevents injury due to tremor.

2. The chest is oblique, the front chest is small, and it can be moved. The foot is close to the head (to facilitate predation). The abdomen is elongated. Although the structure of the adults is quite uniform, they vary greatly in size, and the wingspan is generally 5 cm. From the smallest centimeter to the largest centimeter.

3. Dragonfly has a slender, flat or cylindrical abdomen, with an anal appendage at the end. The feet are thin and weak, with hooked spines that catch pests while flying through the air. The male mating apparatus is located on the abdomen.

On the second and third sections of the web. Male and female copulation also takes place in the air. Most females place their eggs in the water several times when they fly quickly on the surface of the water, and some insert their abdomen into shallow water to lay their eggs at the bottom. <>

Dragonflies use compound eyes to see the east and the west. The details are as follows:

1. First of all, the compound eyes of dragonflies are composed of some small eyes, as few as five or six, and as many as tens of thousands (as shown in the figure below).

2. The reflected light emitted by the object then enters the dragonfly's compound eye (as shown in the figure below).

3. Then the light source information enters the visual center (as shown in the figure below).

4. Form a light point image, which is the last image seen by the dragonfly (as shown in the figure below).

Appearance characteristics of dragonflies:

Dragonfly is a generic name for invertebrates, insects, dragonflies, and suborder Paraptera. Dragonflies have slightly larger hindwing bases than forewings, and their wing veins are slightly different. When resting, the wings lie flat on the sides. The larvae are short and thick, with rectal gills and no caudal gills.

Adult dragonflies have round heads and large compound eyes. It has a box-shaped chest and two pairs of long wings, which can be flapped alternately and can also fly in the air at fixed points. When resting, the wings are flat and vertically combined.

The abdomen is elongated. Dragonflies feed on carnivorous food, mainly in the air to hunt mosquitoes, fly oaks, butterflies, and even other species of dragonflies. <>