These adorable cats – which are twins – showcase their contrasting blue and green eyes. The fascinating pair, Iriss and Abyss, live with their owner Pavel Dyagilev, 34, in St. Petersburg, Russia. The cats have a condition called heterochromia iridis, which causes each eye to vary in color. Dyagilev said: “When I found an ad on social media that two kittens were seeking a new home, I never imagined that I'd end up with two. But I looked through the pictures of kittens and saw two twins always together on the photos. And my heart melted”. (Photo by @sis.twins/Caters News Agency)