Biologists in Southern California caught their first glimpse of Simi Hills’ newest residents last week: four fluffy mountain lion kittens. The all-female litter is the first scientists have documented in the Simi Hills, an area long devoid of the big cats due to its proximity to two major highways.

Because mountain lions—also known as cougars—typically den in caves and thick brush, locating their litters can be challenging. But this posse of blue-eyed, speckled kittens was easy to find. That’s because biologists from the National Park Service outfitted their mother, known as P-62, with a GPS collar back in February, so they could track her movements.

When biologist Jeff Sikich noticed P-62’s movements had become highly localized, he