Iriss and Abyss

Iriss and Abyss are white-coated domestic shorthair twin sisters living in Saint Petersburg, Russia, with owner Pavel Dyagilev, who started the joint Instagram account @sis.twins in 2018 to highlight their unusual symmetrical heterochromia. Each cat carries one blue eye and one amber-brown eye, and the two are mirrored when photographed together: Iriss's blue eye is on her right side, while Abyss's blue eye is on her left, producing a near-perfect mirror symmetry when the two are seated side by side facing the camera. The genetic basis is heterochromia iridum tied to the white-coat W gene, which suppresses melanocyte migration during embryonic development and produces both the white coat and the partial blue-eye phenotype. The condition is common in white cats but exceptionally rare in twin form, particularly when the heterochromia is mirrored across siblings, and the case has been cited in subsequent veterinary-genetics teaching material as a teaching example for the W gene's expression. The cats were born to a white domestic mother and a black-and-white father, both ordinary house cats, and Dyagilev acquired both kittens from the same litter at approximately eight weeks. Bored Panda, My Modern Met, Oddity Central, and a long subsequent tail of pet-content aggregators all ran galleries on the account in 2018, pushing followers past 100,000 within months and crossing approximately 200,000 by 2020. Dyagilev mostly shoots the cats at home in his Saint Petersburg apartment, leaning on the symmetrical framing rather than props, costumes, or location variety. The account's editorial discipline (consistently symmetric compositions, neutral backgrounds, paired frontal portraits) distinguishes it from peer accounts that diversify content through narrative or location. Veterinary commentary accompanying the coverage has noted that white-coated cats with the W gene carry an elevated risk of congenital sensorineural deafness, and Dyagilev has discussed in interviews that both cats have been audiologically tested and have normal hearing, an outcome that occurs but is not guaranteed. The cats were approximately seven in 2025 with continued account activity, and the genetic curiosity has produced sustained academic and breeder-press interest.