It's a sad fact that we're losing our songbirds. In the twenty odd years that I've lived on our land, the number and variety of birds has diminished. And those are just the ones I know by sight. This is mostly due to loss of habitat. It's not just the destruction of forest in wintering areas, but the break-up of the continuous bands of cover that used to exist.
Many species require large tracts of unbroken habitat to survive.
Individually, we can't do a lot to stop mass distraction of habitat through construction and clear cutting, but we can make our gardens hospitable to many species, both to their benefit and our own. Our shady gardens will attract different species than sunny gardens will. If you live in another part of the world or the US than I do, the birds that visit you will differ from those that visit me in my Mid-Atlantic USDA zone 7 garden. I've never been able to spot this bird, but I listen each spring to make sure one has returned to sing accompaniment to my garden tasks through the summer. If we have wooded areas, we're likely to see some of the woodpecker family.