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:
- The number of birds in North America has rapidly declined over time.
- To reinforce this, the author shows that since 1970 America has lost around three billion birds and that this number corresponds to more than a quarter of the total population of birds across the continent.
- This data is important in giving readers a proportion of the severity of this problem.
- This way the reader has a base of when it is important to act so that these numbers do not increase.
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
