Why Does Spiders Have 8 Eyes?
WouterThe number of eyes spiders have depends on the species. Some of them have four, while others have eight. There are also some that do not have any eyes at all. These animals rely on their taste, smell and touch to navigate and find food.
The primary eyes of spiders are fixed in place. These help them detect movement and create an image. They are called ocelli. These images are formed through the blending of light and dark. They may also provide color vision. Some spiders have additional eyes, known as secondary eyes, to aid in motion detection and tracking.
These eyes are also called ocelli. They are arranged along the sides of the spider’s head. They are used for classification purposes. They are also used for hunting. They help the spider track a moving object or its prey.
These secondary eyes are also derived from compound eyes. They are usually round or oval. They are usually smaller than the principal eyes, and may be on the back or on the sides. Some may be semilunar. These eye spots can independently monitor the intensity of light that falls on them.
These eyes are important for hunting prey and detecting danger. They may be small, but they are often able to alert the spider to the movement of predators.
Some spiders don’t even have eyes at all. These creatures can be found in caves. They still have an ability to detect danger and food, but they need other adaptations to do so.
