I have this guy outside my bedroom who demonstrates constantly that his is the guy, using a constant and consistent chirp. I have no idea what type of bird he is, let alone if his dating pitch is leading to a coffee or something more.
Building nests is something I never understood about birds. Clearly it is instinctive for the female birds, and in some species along with the male.
I also admire birds with newly hatched chicks that they are able to find food and then provide it to the babies. I find it problematic to feed myself at times, let alone barf up what I ate to provide it to my kids.
Fortunately, my little birds are now young adults and seem to be doing fine without worms barfed up from me or their mother.
I will refrain from observations about empty nests and those that remain to be built.