I for one think that the song is fine with just two verses.

Many people don't realize that to rob a bird's nest is to rob it of its eggs. Some Victorians were avid collectors of bird eggs, for some reason, adding to the stress on birds trying to survive as the Industrial Revolution trudged on. As a bird lover, I hate the idea.

Furthermore, I have modified the tune to make it sound less like a sean nos lament about a massacre.