Wisdom and contempt
The owl sits on a branch. He sees all and knows all. He is the embodiment of sapience. Or, in other words, the owl represents the virtue of wisdom. If you're like the owl, you too possess great knowledge, and you're able to harness experiences, learn from them, and make sound decisions moving forward. As always though, there's a catch. You'll notice that the owl is alone on the branch.
Leaving aside the fact that he's a predator, the owl's predicament is most likely the result of the vice of contempt. Contempt is an unenviable trait causing those with wisdom to look down upon those lacking intelligence. And, like the owl, they might be left to sit on a branch, or a park bench, by themselves. So, heed the words of Socrates: "The only true wisdom is in knowing you know nothing."