It's nothing brilliant, but I tried.
Different people have different opinions on this issue. In my opinion, this shows that we should not be busy catering to anything. It is unwise to keep flying in order to leave traces of birds. What did the birds miss when they were busy flying? Did you miss the scenery or starve to death to feed the baby in the nest, or ignored the potential falcon?
Recently, I read a sentence, "Don't waste your work because of people, things and theories." I think this is also the philosophical thinking of the ancients.