An Odd-Eyed Turkish Van Cat.

A Van cat with two different eye colours is seen at Yüzüncü Yıl University in Van, Turkey.
The Van cat is a distinctive landrace of domestic cat, found in the Lake Van region of eastern Turkey.
It is relatively large, has a chalky white coat, sometimes with ruddy coloration on the head and hindquarters, and has blue or amber eyes or is odd-eyed.
The variety has been referred to as “the swimming cat”, and observed to swim in Lake Van.
Photograph: Özkan Bilgin/Anadolu Agency/Getty Images
Source: Christmas lights and an odd-eyed cat: Wednesday’s best photos | News | The Guardian