Stockholm, Sweden - A woman from Sweden took in two feral cats, and after a short time, she noticed their peculiar behavior!

In a viral video on the Instagram page @katakatica26, the black furry friends named Doom and Gloom can be seen romping around together in the living room.

The kittens rub their heads together, cuddle, and play.

What's striking, though, is that they don't leave each other's side for a second.

The apt text in the clip reads, "POV: Your feral rescue cats are absolutely inseparable (and also... strangely identical)."

However, there is more to the cute duo than just internet fame. Owner Kata Ördög told Newsweek that the two felines came from a nearby cat colony.

The animals ran wild and were left to fend for themselves when they were abandoned by their previous owners. The strays were nursed back to health and carefully socialized at the animal shelter.

In terms of character, the cats could hardly be more different.

Kata said Gloom is their definitive "leader." He demands his food with a playful bite, wriggles around her legs, and enjoys extensive cuddles.

Doom, on the other hand, is the more sensitive one: he loves to have his chin stroked, meows a lot, and likes to sleep.

The first few days in their new home were a test of patience for Kata. The two often hid during the day and only came out at night, but their new owner soon noticed how much they oriented themselves towards each other.

The names of the fluffy wild cats may sound a bit grim, but as Kata is a big fan of the Japanese manga series Sailor Moon, she deliberately named her new pets after characters that appear in the series.

The adorable duo has become an internet sensation.

"Omg they are so precious," one user commented under the viral clip, while another joked, "They're sharing one braincell, that's why they can't be separated."