In the fall, I set up a trail camera at a bear-marking tree in preparation for spring. I didn't expect to see bears because they don't mark much in the fall and then they go to their dens. However, other animals walked past it, giving us another glimpse into the activity in the forest when we humans are not watching.
As you watch the video, you'll see a smallish pine tree in the background with a branch leaned against it. That's my low-tech way of knowing if bears have been marking it. They cannot mark it without knocking down the branch.
This is another site that I thought would be impacted by the nearby fire. Fire-fighting equipment and personnel passed the cam but the animals did not leave. They must have known that it would be okay while all the rest of us were worrying.
It's a short video - and be sure to watch to the end. There's a fun snippet to see.