What is the importance of using both Christmas Bird Count (CBC) and Breeding Bird Survey (BBS) data?
For the first time, this analysis includes 40 years of national-level data from two different surveys – BBS and CBC. Looking at, and, where appropriate, combining the data gives us the clearest possible picture of what is happening to these bird populations. Unfortunately, we found a lot of news that is not good and that means people need to take action to help the birds and the habitats they share with all of us.
