Two mountain lion kittens, a male and a female, were found tucked away in a well-hidden den in the Santa Monica Mountains by National Park Service biologists in December.

The adorable cubs have since been tagged with GPS trackers and given the handles P-46 (female) and P-47 (male).

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Officials with the Santa Monica Mountains National Recreational Area place a strong likelihood on P-19 as the mother of the newbies. The giveaway was that her own GPS tracker became suspiciously localized during a three-week stretch where, it’s presumed, she was in the den staying with her newborns.

Next comes an attempt to name the daddy. P-19 has been tracked since 2010, when she was only weeks old. She’s had previous litters, from mating with her father P-12. But, P-12 hasn’t been seen since March of last year. Scientists hope DNA testing can rule him in or out. Otherwise, they say, another potential daddy could be a newer male on the scene, P-45.

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It may be best to root for P-45, as officials say interbreeding is a serious threat to Santa Monica Mountains’ mountain lions, which are hemmed in by human life in the form of structures such as the 101 Freeway.

“We continue to see successful reproduction, which indicates that the quality of the natural habitat is high for such a relatively urbanized area,” said Jeff Sikich, a biologist for Santa Monica Mountains National Recreation Area, in a statement.

“But,” he added, “these kittens have many challenges ahead of them, from evading other mountain lions, to crossing freeways, to dealing with exposure to rat poison.”

The two new cubs represent the ninth litter of kittens found in a den, park service officials said.