That’s good news regarding increase in the population. Many here are putting up Bluebird boxes - I think that is one good reason for the increase.
Chickadees are sweet little birds too! Moved in eh, LOL.
Some years ago local officials, the local college and conservation commission led efforts to install hundreds of bluebird boxes on local public land and that did the trick. They’ve made a huge comeback.
Did you know that the bluebird is NY’s state bird? Plus the chickadees that took over the bluebird house are MA’s state bird. But I don’t consider that a conflict. ;-)