I remember that when I was a kid in the 1970s, Brooklyn Union Gas used to put eggs in the windows of its headquarters on Montague Street. Around Easter the eggs would hatch. We would go and watch the eggs develop, and then go and see the chicks.
Brooklyn Union Gas is now called something else and later moved, I think to Metrotech. I'm pretty sure they don't do this anymore.
If anyone is wondering why there are so many nostalgic blogs for "the old New York", there used to be a lot of cool things like this, in fact they weren't even considered to be that remarkable, and now, not so many.