Street patrols increased in two Palo Alto neighborhoods Sunday after residents reported two overnight sightings of mountain lions outside their homes, authorities said. A woman called 911 about 10:10 p.m. Saturday and said she had just spotted a large animal as she drove in front of her house on the 600 block of Wildwood Lane, according to the Police Department. The woman, who was not identified, told authorities she initially thought the animal was a dog, but when she looked closer it became clear it was a mountain lion.