Color Vision in Animals
Color vision in animals is how different species see and tell apart colors with cells in their eyes.
A sorting tray with three slots can separate red, blue, and yellow beads. Each slot only catches one color, so beads land in the right place. An eye with three types of color cells sorts light the same way. A tray with just one slot catches all beads but cannot tell them apart.
Explaining color vision in animals by grade level
Dogs do not see colors the same way you do. They can see blue and yellow, but red and green look the same to them. You can test this by giving a dog a blue toy and a red toy. The dog picks the blue one because it stands out more.
Projects that explore color vision in animals
Some species can see and remember colors well enough to use them as a guide. You train ten Diamondback terrapins for one week to eat only from a blue tray. After training, you place blue, red, and yellow trays side by side and rearrange their positions across three days. This tests whether the turtles follow the blue color or simply go to the same spot each time. Most terrapins headed for the blue tray regardless of its position — showing they use color, not location, to find food.
The cells in an animal's eyes may distinguish some colors but not others. To test this in dogs, you train five breeds to pick a blue box for a ball and a red box for a bone over two weeks. Then you place all four colored boxes together and give each dog ten tries. The dogs pick the blue box correctly about 82% of the time. With red and green boxes, though, they score only 46% — no better than random chance. That pattern suggests dogs can tell blue from yellow but cannot separate red from green.