Scientists Finally Figure Out Why Some Cats Are Orange, PLUS: Are Street Cats Really ‘Taking Over?’

More than 110 years ago, American geneticist Clarence Cook Little developed a theory explaining why some cats have orange coloring and some don’t.

Now Little has been proven correct thanks to the work of separate teams in Japan and the US, which discovered the mechanism that leads to orange coloring, including fully ginger felines as well as calicos and tortoiseshells.

The explanation may be a bit too heavy on genetics for some readers, but essentially the researchers found the specific gene that leads to the growth or orange fur. They’ve known about the gene for a long time, but didn’t realize the totality of its function. Its official name is ARHGAP36, but for the sake of simplicity, scientists are calling it “the orange gene.”

“The orange gene has a known role in hair follicle development, but scientists didn’t previously know it is also involved in pigment production,” a team of geneticists and biotechnologists wrote in The Conversation, a science publication. “This means that a new pathway for pigment production has been discovered, opening the way for exciting and important research into a basic biological process.”

Ginger cats are usually male, but the pigmant can also appear in female cats due to an error in gene copying which deletes one segment of the orange pigment-producing genetic code.

That’s why calicos and tortoiseshells have orange blotches or mixed orange fur. “[T]he orange gene is persistently switched on in orange areas but is mostly switched off in non-orange areas of a cat’s coat,” the authors wrote.

Are there more strays in 2024?

Time magazine has a story examining the problem of stray cats in America’s urban and suburban population centers, why it’s happening, and what can be done about it.

First, might as well get this out of the way: We don’t know if there are “more” cats. The claim that there are more relies on anecdotes, and there’s no hard data to back that up. You have to be highly motivated to invest the time and money into a proper census like the D.C. Cat Count, and it’s an understatement to say most towns and cities are either not willing to do that, or don’t have the resources.

What we do know is there may be more cats in certain areas, with individual shelters in some places reporting record numbers of surrenders and cats scooped up by animal control.

The story quotes rescuers who say they’ve seen more surrendered pets, as well as data from Shelter Animals Count, which tallies self-reported information from shelters and rescues. The latter says 32 percent of cats taken in were owner surrenders in 2024, compared to 30.5 percent in 2019.

“It’s a combination of people surrendering their pets and people not adopting because they’re not sure they can take on the financial commitment,” Animal Care Centers of NYC’s Katy Hansen told Time.

Rescuers say that’s reflected in their experiences trapping the felines, who are friendly and acclimated to humans.

The people surrendering their pets cite inflation, not only impacting the cost of essentials like food and litter, but also more expensive veterinary care.

The story additionally includes this eye-popping detail:

“At Veterinary Care Group, a private equity-owned practice in Brooklyn, the cost of spaying or neutering a cat has soared to $850 per animal. By contrast, at the nonprofit veterinary clinic Zweigart recently founded in Brooklyn, the cost of spaying or neutering a cat is $225 and a mid-sized dog is $300.”

The lesson here: Steer well clear of veterinary clinics that aren’t vet-owned or are obtuse about their ownership. Private equity groups don’t buy clinics out of love for animals.

As for solutions to local spikes in stray populations, the story doesn’t offer any. It mentions TNR (trap, neuter, return) but only in the context of a lawsuit against the San Diego Humane Society for its neuter/vaccination program.

That said, there probably isn’t a one-size-fits-all technique. What works for a small town won’t necessarily work in a city, and there are dozens of factors that could influence the prevalence of stray cats and colonies. Still, city councils and town boards don’t need to reinvent the wheel. Chances are if they look, they’ll find a municipality similar to their own where locals have successfully stabilized feline populations.

As for the Buddies, I’d live in my car before giving Bud up. He wouldn’t be thrilled about that situation, and we’d have to head south because the winters here are brutal, but as long as Bud has his servant, he’s good.

A previous version of this post incorrectly described cat chromosomes. The story has been updated to remove the error.