. >> whitaker: jeff sikich is a park service biologist, an expert on big cats who holds something of a record-- he's seen and captured p-22 four times now. this time, he corners the animal and hits him with a tranquilizer dart. quickly, it knocks p-22 out, with his eyes still open. the batteries on his gps collar were running low. replacing them gives sikich and his crew a chance for a checkup. p-22 is healthy, weighing in at 125 pounds. from experience, sikich knows that when the animal comes to, it's no threat-- the instinct to get away from people kicks in. up and stumbles back into the shadows. >> sikich: here's the past eight traveled. >> whitaker: the gps signals from their collars tell sikich and his colleague seth riley where the animals roam. p-22 wanders the hills of griffith park, a small enclave in los angeles frequented by hikers and visitors to the park's famed observatory. >> seth riley: we haven't-- knock on wood-- had any major conflicts with him and people. and it shows that even a large carnivore like a mountain lion can live right among people for many years. >> w