Can Animals See Red Light?: Discovering the Visual World of Animals and Light Perception

Many animals perceive the world differently than humans, particularly when it comes to the spectrum of visible light. While human eyes are sensitive to red, green, and blue wavelengths, animals often have different combinations and numbers of cone cells in their eyes, influencing what colors they can detect. Most mammals, for example, are dichromatic, meaning they see the world primarily in shades of blue and green and generally do not perceive red light as humans do. This is why some nocturnal animals, such as rodents or certain marsupials, respond very little or not at all to red light—because their visual systems lack the red-sensitive cones entirely. Birds and some reptiles, on the other hand, are often tetrachromatic and may actually see red—even colors beyond human vision, such as ultraviolet.

From a designer’s perspective, understanding animal perception of red light is crucial for creating comfortable, species-appropriate environments in homes, exhibitions, or veterinary spaces. For instance, using red lighting in an aquarium or terrarium can facilitate unobtrusive nighttime observation; many reptiles, amphibians, or invertebrates are less disturbed by red wavelengths. Similarly, pet-friendly interior environments benefit from knowledge of animal vision, allowing for careful selection of lighting schemes that ensure both function and comfort. For those who want to experiment with layouts and lighting in various rooms—including pet spaces—incorporating specialized planning tools such as a room planner can be invaluable for visualizing and optimizing both human and animal experiences within the same living area.

Tips 1:

If you’re planning a space shared with pets, consider their sensory sensitivities. Choose soft, indirect lighting and avoid intense or changing colors that might cause stress. Creating multi-level environments or adding cozy nooks can also help animals feel secure and at home.

FAQ

Q: Do dogs and cats see red light?

A: Dogs and cats mostly see blues and greens; red appears as a shade of gray or brown to them, meaning red light isn’t distinctive in their eyes.

Q: Can red light disturb nocturnal animals?

A: Many nocturnal animals either cannot see red light or detect it poorly, making red bulbs a popular choice for nighttime observation without disturbing their natural behaviors.

Q: Are there any animals that can see red better than humans?

A: Some birds, reptiles, and amphibians can see not only red but also ultraviolet, surpassing human color perception.

Q: Why is red light used in some zoos and aquariums?

A: Red light allows caretakers and observers to watch animals at night without affecting their circadian rhythms or causing stress, since many species are less sensitive to red wavelengths.

Q: Should I use red light in my pet’s living area?

A: It depends on the species. For most dogs and cats, red light won’t have much effect, but for some reptiles and nocturnal animals, it can be beneficial for observing them after dark without disruption.