On a ridge near a favorite trail of Shyla's and mine, mountain lions pass by scent scrapes amazingly regularly. Usually, one passes through, and then he's gone for a few weeks.
Recently, one lion seemed to return repeatedly, and it was almost always during daylight. Shyla alerted me that he'd been there as I mountain biked along the trail. When a lion has scent marked there, Shyla sniffs the area extensively, lingering there for longer than usual. That tells me to check the cam.
On the last occasion that she did that, I was astounded by the daylight visits by a mountain lion. My guess is that he made a kill somewhere in the area, and so he stuck around for about a week. Each time he moved between the spot where he snoozed during the day and the spot where he'd cached the carcass, he stopped to check the scent posts. It seems as if he sometimes skips scent marking if he doesn't smell that any other mountain lions have been there.
As you watch this video, imagine a human trail about 10-20 yards to the side of the route that the lion is using. That's where Shyla and I ride, and that's why I feel a moment of worry when I see a mountain lion has been there during daylight.