The author includes this information to show how the decline in bird numbers in North America is an alarming issue.
Although you haven't shown it, we can see that this question is about the article "We’re losing birds at an alarming rate. We can do something about it," written by Michael Parr.
By reading this article, we can see that:
In other words, we can say that by bringing numerical data, the author showed the problem of the loss of birds more objectively and credibly, as he presented confirmed data.
More information:
https://brainly.com/question/9463421?referrer=searchResults