By Brooke Moore, New Windsor, Senior Master Gardener Volunteer
This article appeared in the September 2019 Issue of Gardening in Orange County. Click here to subscribe!
We live in a colorful world filled with plants, animals, and objects that are brightly colored or, in some cases, patterned, or even singular in color. As humans we often think that the rest of the world sees itself and its surroundings in the same way that we do. But nothing could be further than the truth.
![Close up of a blue human eye.](https://blogs.cornell.edu/master-gardeners-cce-oc/files/2019/09/human-eye-150x150.jpg)
Learning more about how he saw the world and experienced paintings, gardens and simple things like traffic lights began my interest in color and how we can manipulate our surroundings based on adding or subtracting colors from a situation.
![Close-uo of the head of a fly - white head, lots of black hairs and large red eyes in which you can see teh individaul lenses](https://blogs.cornell.edu/master-gardeners-cce-oc/files/2019/08/fly-eye-150x150.jpg)
The animals who live among us and in our gardens perceive color in many different ways, and they interact with the plants we grow depending on what they see and how they see and interpret light.
All eyes use reflected light to create images that are the basis of sight. As humans, we have sight that can determine the shape, size and special relationship of objects, and we have sight that is color-based.
![Close up of an owl eye - bright yellow eye surrounded by white, brown and black plummage](https://blogs.cornell.edu/master-gardeners-cce-oc/files/2019/08/owl-eye-150x150.jpg)
The same is true for animals. Birds have keen color sight that helps them with foraging for food, identifying prey and recognizing others of their species. Many scientists have been astonished to discover that some birds may not be able to see all the colors of their own plumage, while other birds can see more than enough colors to find and attract a mate.
Bird Vision
![A graph with absorbance on the y-axis (0-1.0) and wave length (330 nm - 700 nm) on the x-axis. There are four lines on the graph, all of them bell shape-esque. The grey line peaks at 370 nm, which falls in the ultraviolet range. The blue line peaks at 445 nm, which falls in the blue range of the visble light spectrum. The green line peaks at 508 nm, which falls in the green range of the visible light spectrum. The red line peaks at 565 nm, which falls in the yellow/orange range of the visible light spectrum.](https://blogs.cornell.edu/master-gardeners-cce-oc/files/2019/08/BirdVisualPigmentSensitivity.svg-1024x735.png)
Birds see more colors than humans as they are able to use ultraviolet (UV) light due to having four types of cones in their retinas – in contrast to humans who have three types of cones. Different species of birds have more or fewer cone cells in their retinas and thus different ability to see colors. The ability to determine subtle differences in shades of colors is an evolving ability in birds and thought to be something that aids in adapting to change in environment and availability of food sources.
State | Types of cone cells | Approx. number of colors perceived | Carriers |
Monochromacy | 1 | 200 | Marine mammals, owl monkey, Australian sea lion, achromat primates |
Dichromacy | 2 | 40,000 | Most terrestrial non-primate mammals, color blind primates |
Trichromacy | 3 | 10 million | Most primates, especially great apes (such as humans), marsupials, some insects (such as honeybees) |
Tetrachromacy | 4 | 100 million | Most reptiles, amphibians, birds and insects, rarely humans |
Pentachromacy | 5 | 10 billion | Some insects (specific species of butterflies), some birds (pigeons for instance) |
The UV reflection from the waxy surface of fruits and berries makes them stand out from the green of foliage – and birds are better able to find them. Red berries are seen best and will be eaten first, so also growing some plants that produce orange or yellow fruit will extend the feeding season.
![By Dave Kennard - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=31385606 Top picture: A sinlge stem with two flower buds and one small yellow flower with four petals. Bottom: The same photo taken in UV light. The flower is now white with a black center.](https://blogs.cornell.edu/master-gardeners-cce-oc/files/2019/08/Jasminum-nudiflorum-Winter-jasmine-Vis-UV-224x300.jpg)
Many insects also reflect UV light, making them more attractive to birds as a food source. Certain bird eggs reflect UV light and help birds to identify their own eggs and reject those put in the nest by other birds. Many flowers have nectar guides that reflect UV light. These marking are visible to bees and butterflies allowing them to easily find the nectar at the center of the flower.
Deer have poor color vision limited to short (blue) and middle (green) wave lengths of color. They may have some UV sensitivity but not much compared to birds. Foxes do not see green and have little ability to see blue, red or yellow. So, these animals are not using color in the garden to find or choose what they eat!
Understanding which animals use color to find and choose food can help us in identifying plants to put into our gardens, and plants to leave out. It also can put to rest myths like deer choosing red tulips over yellow daffodils -because they are making a choice based on taste and smell, not sight.