|This Siberian husky has heterochromia.|
I received this suggestion recently and I thought it would make a good topic. Heterochromia is, very simply, when an individual has two different eye colors. One may be blue and the other brown, or many of a number of other combinations. It may even be partial, where only a part of the eye is differently colored. Though uncommon in people, it is quite common in dogs, cats, and certain other animals.
|This merle dog has heterochromia|
|This extreme piebald dog has a blue eye|
|This husky shows classic "bi-eyes"|
I will be expanding on this soon with a follow-up post on heterochromia in humans and other animals. In addition, I will look at heterochromia and how it relates to disease and also certain specific types of mutation.
Images are from Wikimedia Commons under Creative Commons licenses: one, two, three, four.