Imagine seeing someone with odd-colored eyes: blue on one side, brown on the other. Mesmerizing, isn't it? This phenomenon has a name: heterochromia. If you've ever heard of this particularity or have ...

Figure 2 (left side): The predicted colors of the brown eyes of the ancestral felid. The proportion of the square that each shade takes up indicates the estimated proportion of each color that would ...

Photos of fly eyes with different colors ranging from normal (left, red) to abnormal (bright red, middle, mutation in the cinnabar gene), and white, right (mutation in the white gene). Abnormal eye ...