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Jinx the cat was so grateful to UK couple Martin Rosinski and Michelle Bowyer for giving her a home that she decided to bring them a gift.

“The first time I was working at home, I heard Michelle making a commotion because Jinx had come in with a mouse and dumped it on the carpet in front of her as a ‘thank you’. That’s their way of expressing love. You can’t tell her off, so we thanked her a lot for it and took it away from her,” Rosinski said.

“Then this started happening more and more often to the point where we would be woken up at 2 a.m. as Jinx would meow loudly and announce, ‘Hey I have a gift. If we didn’t get to her fast enough she would decide to eat it herself, which would involve piles of mouse parts being smeared into the carpet. This was happening at 2 a.m., then again at 4 a.m. on many nights and we’d not get any sleep having to deal with this. Her record was four in one night – that night was a frenzy of three mice and one bird. It was something that was a real cause of stress.”

The solution is pretty simple, right? Keep Jinx inside.

The former stray won’t like it at first. There will be an adjustment period when the meowing will be seriously annoying. But it’s better than allowing your cat to play Predator at night and waking up to find your cat sitting on your chest, proudly presenting a twitching mouse to you.

Rosinski and Bowyer didn’t take Jinx inside.

Instead they created a bespoke intelligent cat flap that allows Jinx to come and go as she pleases, but won’t open if she’s carrying prey. They both have backgrounds in tech: he’s a researcher who also tinkers with software and hardware, and she’s a web developer.

Their system, OnlyCat, uses a camera and an algorithm to determine if Jinx is carrying something in her mouth. If she is, the cat flap won’t grant her access, and Bowyer and Rosinski will get a text informing them Jinx has been up to her hi-jinx again, along with a photo of her entry attempt.

The OnlyCat prototype has prevented Jinx from bringing in 42 prey animals since June of 2021, the couple said. OnlyCat may prevent her from bringing her prey inside, but it hasn’t dissuaded her from killing.

“Two months ago I think something clicked and she realized, ‘I can’t bring these home. It’s just not going to work,’” Rosinski told the UK’s South West News Service. “She still catches them outside but she’s learned that there’s no point even trying to bring them home, which is a relief.”

The couple developed the OnlyCat into a full product, which launches on Aug. 16 at £499. (A little more than $600 USD.) Their site says the retail version of the flap has worked 100 percent of the time in tests, and the developers believe “99%+ accuracy should be achievable for everyone.”

It’s similar to a device built by Amazon engineer Ben Hamm which uses DeepLens, an AI-enabled camera system, and Sagemaker, a software tool for training machine-learning algorithms, to determine if cats are carrying prey.

Hamm’s version, which he created for his cat Metric in 2019, initiates a 15-minute lockout timer if Metric tries to enter while carrying a kill, and automatically sends a donation to the National Audubon Society, which protects birds and their habitats. The algorithm was trained using tens of thousands of images of cats approaching normally, and with prey in their mouths. So far, Hamm hasn’t developed a retail version of his AI-enabled cat flap.

We don’t think there’s any one way to raise cats, and it’s obvious there are different cat cultures in various countries.

Nevertheless, seven out of 10 cat owners in the UK allow their cats to roam free, and anecdotes like the ones about Jinx, with her multiple kills a night habit, draw the ire of birders and conservationists.

Peter Marra is the author of Cat Wars: The Devastating Consequences Of A Cuddly Killer and co-author of many of the leading studies claiming cats are the primary threat to bird populations. He’s currently making the media rounds and endorsing strict policies — many of them in enacted in response to his studies — that would make it illegal to allow cats outdoors.

The Australian government is airdropping poisoned sausages by the ton in a plan to cull as many as two million cats, a town in Germany tried to ban outdoor cats, a US politician recently suggested starting a “hunting season” for feral and stray felines, and some people — including wildlife biologists and conservationists — have gone vigilante and convinced themselves they’re doing good by randomly picking off cats with shotguns and poisoning feeding stations for strays.

Maybe it’s time for more people to reconsider allowing their cats to roam free. Like putting a cat on a diet or trying to break a bad habit, there’ll be loud and annoying protests in meow, and it’ll get worse before it gets better, but eventually cats always adjust to changes if given long enough.

As domesticated animals they don’t have a natural habitat anymore, and they don’t actually need to be outside. It’s entirely possible to keep things fun and interesting for the furry little guys, and that’s on us. All that’s required is our time, attention and affection. Interactive play time. Toys that can keep a cat occupied by herself. Catnip. Condos and tunnels. Window perches. Cat TV on Youtube. Simple things to play with, like plastic bottle rings, crinkled tin foil and cardboard boxes.

We don’t think anyone should be required to keep their cats indoors, and that’s the point. We have an opportunity to meet conservationists halfway and make a real effort to reduce feline impact on small wildlife. If we don’t, eventually we’ll be forced to comply by laws that’ll be draconian compared to the voluntary measures we could have taken to prevent the government from getting involved.