National Park Service. Researchers believe this is her first litter. Approximately 90 days later, researchers noticed a series of localized GPS locations indicating that either P was feeding at a kill site or that she had given birth. Each kitten was given an ear tag to help identify them in the future, samples were taken for genetic testing, and all were returned to the den. P has been tracked by biologists in the Santa Monica Mountains practically her entire life. She was born in January and the following month, NPS researchers marked her with a tracking device as a kitten while her mother, P, was away from the den. Fortunately, she survived.