It might be empty by scientific knowledge
It's a fiction, but it should be opportunity which has an interest in a wild bird. Author's feelings seem also same for this. Wildlife is a principle of "the survival of the fittest", and prey-predator relationship seems decided naturally, and the fact that I fail actually and and exists. It might be empty by scientific knowledge, but a close cooperative relationship of a wild bird felt to be enough educational by the meaning to bring up the upper part and to be also excellent as child's something to read.