PESCADERO (CBS SF) — An aggressive mountain lion has residents and officials in San Mateo County on alert.

According to an alert issued Tuesday, the cat was spotted at about 4:00 a.m., in a backyard in the 5000 block of Pescadero Creek Road, in Pescadero.

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Officials warn the mountain lion has killed small livestock in a resident’s backyard.

“The animal approached the back door of the home and was not intimidated by two large pitbulls that confronted it at the time,” said the alert.

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Residents are advised to be cautious, especially in the late evening and early morning hours.

According to the National Park Service, if you do spot a mountain lion, stay calm, never approach, do NOT crouch or bend over, back away, but never run.

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For more information and other ways to stay safe in the event of a mountain lion, consult the National Park Services website.