Wealthy Londoners freaked out at the sight of a Savannah cat on Monday, confusing the domestic-Serval hybrid for a big cat.

The pet kitty was stalking the gardens of a neighborhood known as billionaire’s row in East Finchey, north London, when it caught the attention of a mother and daughter who called police to report a large felid.

“I was sitting having dinner with my daughter in the garden when the head appeared. It looked normal so I didn’t take much notice but then the body came out,” the mother told the Evening Standard. “It was elongated, really too big for a domestic pet. The markings were like that of a cheetah or leopard.”

“We were scared. I said to myself ‘we should not be here’ and ran in the house. I took a picture on the way, it was frightening.”

“We called the police and armed officers started the hunt for the animal. They told us to stay inside. There were two police helicopters overhead. It was very dramatic, I can understand it. At that stage they had to think it was a dangerous wildcat.”

Leon Grant, who lives nearby, told the newspaper that police and neighbors thought they were dealing with a big cat.

“It was pandemonium,” Grant said. “There was a police helicopter whirring overhead and armed police and all sorts. It was being dealt with as a huge incident.”

The police, who were accompanied by a wildlife expert, stood down after they realized they were dealing with a pet, the BBC reported. The cops hadn’t found the owner, but said keeping a Savannah cat isn’t illegal in London or its outlying areas.

Savannah cats are hybrids of domestic cats and servals, mid-sized African wildcats. The somewhat controversial breed is energetic, intelligent and needs a lot of stimulation, much like a working dog.

To be fair to the Londoners who were alarmed by the sight of the rare cat, the breed is considerably larger than typical domestic cats. A pet Savannah is about the size of two, maybe two-and-a-half Buddies: (Although not nearly as ripped or as fearsome, obviously.)

First-generation hybrids, known as F1 Savannahs, are not considered suitable pets. Typically breeders sell F3 (third generation) or F4 cats to the general public. A Savannah cat can cost as much as $20,000 in the US, and like all exotic breeds, they’re controversial because many activists feel people shouldn’t buy pets when 1.5 million homeless cats and dogs are euthanized every year.