На информационном ресурсе применяются рекомендательные технологии (информационные технологии предоставления информации на основе сбора, систематизации и анализа сведений, относящихся к предпочтениям пользователей сети "Интернет", находящихся на территории Российской Федерации)


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Learn about What do animals see & Animal senses

How animals see in the dark.....

Some animals see differently than we do. Some animals, like bees, have cones for colors we can't see. Some animals have developed a highly-advanced senses of smell or specialized hearing abilities such as echolocation. Others have acquired eye adaptations for improved night vision

Big Eyes

The most interesting feature of nocturnal animals is the size of their eyes. Large eyes, with a wider pupil, larger lens and increased retinal surface collect more light.

Some animal species have evolved tubular eyes as a means of increasing their size. Many nocturnal animals cannot move their eyes within the orbit. Instead, they have evolved extraordinary rotational ability in the neck. Owls, for example, can rotate their neck through 270° & this aids their vision.

Some animals of the night have acquired a spherical lens and widened cornea to compensate for reduced eye movement. This combined with a wide cornea increases the animals field of view allowing the head and eyes to remain motionless.


Mirrors Add Intensity, Eyes glow in the dark

On a dark night, flash a bright light at your dog or cat's eyes & you notice that their eyes glow in the dark. It is the tapetum lucidum (meaning "bright carpet"), an adaptation for night vision. The tapetum is a thick reflective membrane, 15 cells wide, directly beneath the retina.  It collects and re-emits light back to the retina a second time, giving the rods a second chance to absorb the image information, thus maximizing the little light available to them. As this light is reflected off the tapetum, the animal's eyes appear to glow.

Although nocturnal animals see mostly crude or imperfect shapes, outlines and no colors, by maximizing their sensitivity to low light levels with the above adaptations, it is enough for them to hunt, feed and survive in the dark of night.

In The Daylight

Most nocturnal animals are often  inactive during the day to avoid over-stimulating their highly sensitive eyes. Nocturnal animals have specialized pupils to shut out damaging bright day light. Nocturnal animals dilate their pupils to their circular maximum at night.



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