Mohammad-Zadeh, a veterinarian at DoveLewis Emergency Animal Hospital, also suggests strings can be seductively similar to tails.
"Most of the toys that attract cats tap into their innate predatory sense," she tells The Dodo. "String is interesting to cats because it wiggles and moves as they play with it. It can be unpredictable and it's more of a challenge to 'hunt.'"
The thing is, cats may know all about hidden dimensions, invisible mice and ... GHOSTS!
But when it comes to string, they're dangerously naive.
"It is really bad for them to play with string," Sorbara says. "If they ingest it, it will wrap around their intestines and if not caught in time, they will die."
Likewise, Erick Mears, a veterinarian at BluePearl Veterinary Partners, may not be able to explain why string has such a strong pull on the feline heart - but has seen what it does to other internal organs at the emergency clinic.
"I've seen string, I've seen ribbon, I've seen tinsel," Mears, who specializes in internal medicine, tells The Dodo.
And, he adds, if a cat does swallow string, it's vital that you don't pull it out yourself. It's usually much more complicated on the inside - with string wrapping itself around internal organs and even getting caught behind the cat's tongue.
"If you see a string coming out of their behind or caught in their mouth, do not pull it," Mohammad-Zadeh warns. "The end of the string may be attached to something on their insides and can cause serious damage if pulled. Take your cat to see a veterinarian right away."
Even there, however, removing string is no easy task. Because it isn't metal, there's no way to find it with an X-ray. Instead, an ultrasound may be used. Or else, a tiny camera, with even tinier forceps attached, is snaked into the animal to retrieve the string.
Or else, it's an even more costly - and risky - surgery.