WASHINGTON (AP) -- There are some types of birds that you may not have seen in a while.
A new study suggests that the population of some common American birds is half of what it was 40 years ago. The National Audubon Society compared its own bird count and the U-S Geological Survey's breeding bird survey to a 1967 survey and noted the decline.
Part of the blame lies with suburban sprawl.
But not all species are hurt by the human population boom. There are some birds who appear to be thriving, including the turkey and the Canada goose.
The study's author says birds that need a particular environment are the ones that are suffering, while those that can adapt pretty well are doing fine.