According to a new study reported by WILX, there are 3 billion less wild birds in Northern America than there were in 1970.

In this study, it was found that the bird population in not only the United States, but Canada as well was nearly around 10.1 billion. Since that time, that number has dropped 29%, which is now about 7.2 billion birds.

The lead author of the study, Cornell University conservation scientist Kenneth Rosenberg, says that the lowering rate of birds is clearly happening right in front of our eyes, but it isn't happening quick enough for us to notice.

More information on how the data was collected can be found here.