- Some people are born with eyes of two different colors, a condition known as heterochromia.
- Brown eyes are the most common eye color, with over 55% of the world's population having brown eyes.
- Parents with dark colored eyes sometimes give birth to a baby with green or blue eyes. This is because recessive traits for green/blue eyes can be passed along for many generations before they actually show up in a member of the family.
- Alternatively, it's also possible for two blue-eyed (light eye colored) parents to have a brown-eyed baby.