What are the animals that eyes glow in the dark?

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1199052

2026-02-09 09:05

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No animals have eyes that glow at night. For an animal's eyes to glow at night, the animal's eyes would have to have a light source within them, and no animal has a light source within its eyes. Let's look a bit more closely.

We often see footage (a video or the like) of animals where the film was shot at night. To see animals at night, we often use light sources that are not within the visible spectrum (and, thus, are invivible to animals), like infrared. In any case, the light source is pointed at the subjects (the animals), and the camera, which is sensitive to that frequency (or wavelength, if you prefer) of light captures the action. The "trick" is that the light will be reflected off the retina of the animals that look at the light source, and this reflection wil be picked up by the camera. It will appear that the animal has luminous (glowing) eyes, but it's really an optical trick.

A number of animals can see well at night because light that enters their eyes and is reflected off the retina can be "re-reflected" back onto the retina to improve the resolving power of the animal's vision. As stated above, no animals have light sources within their eyes. And many animals have a retina that will reflect enough of the light from a film maker's source back into the camera lens, thus making the animal's eyes appear to "glow" in the night.

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