I guess you can mail anything

While I was standing in line at the post office today, patiently waiting for the next window to open up, I heard the crowing of a rooster; loud and clear and coming from the window at the other end of the counter. I was looking to see who was going to answer their phone with the rooster crowing ringtone but didn't see anything. Another minute or two later, more crowing. And then I heard one of the clerks ask, "When is that truck coming to pick up those birds?" The second clerk answered, "At four o'clock. At least the roosters aren't as annoying as the chickens we get."