Janie, sorry you lost so many trees. They, no doubt provided cover and nesting sites for song birds. I am afraid that I know very little about natural cover and nesting habits so I can be of little help here. I have quite a few downy woodpeckers and suspect they nest in the area since at various times of the year I see adults and juveniles at the feeders. I do not provide any nesting for them. I also see red-bellied woodpeckers frequently at the feeders. I do not see hairy woodpeckers that often any longer. A significant loss of cover may result in some loss of bird population, but if you still have standing trees you may not notice a loss. I hope you are able to keep the birds who have made your yard their home.