The sensitivity of an animal's eyes to different types of electromagnetic radiation depends on the anatomy and physiology of their eyes. In the case of infrared radiation, many animals have evolved specialized structures that can detect the heat generated by infrared radiation. These structures are called pit organs or heat-sensing pits, and they are found in animals such as snakes, pit vipers, and vampire bats.

These pit organs contain temperature-sensitive cells that respond to infrared radiation by producing electrical signals, which are then processed by the animal's brain to create an image of their surroundings. In contrast, our eyes are not equipped with these specialized structures, which is why we are not able to detect infrared radiation naturally.

However, humans have developed various technologies, such as thermal imaging cameras, that can detect and visualize infrared radiation. These technologies work by converting the heat generated by infrared radiation into an image that can be seen by the human eye or processed by a computer.
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