I suspected as much, though it's certainly longer than 72 hours from egg to door, since I can't imagine they go in a box until after they're up and fluffed.
A couple of years back a postmaster came on the forum and gave what he said were the rules on mailing baby chickens. A normal baby chicken (and other poultry) absorbs the yolk before it hatches and it should be able to live at least 72 hours on that yolk without having eat or drink. At least 72 hours. That way a chick that hatches early can hang around in the nest with Mama while the later ones hatch.
The chicks are supposed to be shipped within 24 hours of them hatching. They don't all hatch at exactly the same time but the chicks have to be sorted, boxed up, and at the shipping location within that 24 hour window. That's tens of thousands of chicks per hatchery, often twice a week. Those people have to be hustling. Probably overnight to meet an early morning shipping deadline.
The chicks are supposed to have a reasonable expectation of being delivered within 48 hours of shipping. That often includes flying across the country, trucking, and sorting at different locations. That's a huge logistics nightmare for trucking companies, airlines, and the post office. And there are additional rules. For example, the airline cannot ship baby chicks if there is dry ice in the cargo hold, because that may suffocate them as it thaws.
Delivery usually means the post office receives the chicks and calls for somebody to come get them. The phone number is supposed to be on a label.
All it takes is for one weather event, mechanical problem, or person to make a mistake to mess this up. Maybe the person at the hatchery mistypes a label, a storm grounds airplanes or ties up traffic, or a package gets sorted incorrectly. To me the post office and their contractors do an amazing job.
This packing slip claims they hatched at 7am Monday, and the shipping label wasn't generated until around10:30PM.
That shipping label starts that 72 hour clock, 24 hours to get them shipped and another 48 hours to get them delivered.
Plus, one does have to wonder... what happens to all the chicks that hatch over the weekend??
They do not hatch over the weekend. That is carefully timed so they hatch when they need to hatch. Some will still hatch outside that window. Those will not live. That does not mean that they are going to be brutally inhumanely killed, many hatcheries have gotten better about that process the last few years, but they will die. Often the bodies are used, they are not just sent to a landfill.
Good news: They most definitely are NOT going back in the mail. Hoorah!
Here's the scoop on the official rules regarding live chicks in the mail:
The rule is 72 hours; if/when it is determined that they can't be a) delivered or b) returned to sender within that time limit, they "must be disposed of immediately"
Stay with me a minute, it's not what it sounds like! "Dispose" in the mail room doesn't mean just throw it out! There's a whole process where all mail that can't be delivered (including our chick friends) is cataloged, opened, inspected and reviewed. Any items that can be reused for business purposes are reused; anything else is donated, recycled or very last resort, disposed of. For perishable items, including live animals, this happens as soon the delivery window has passed or when there is concern about the viability of the contents.
In short, wayward chicks are not just left on a shelf to die; Post Office regulations specifically require real live humans to intervene, and, barring the reintroduction of avian powered air mail delivery, any foundlings will end up going to a good place.
I did not know most of this and my brother was a rural mail carrier until he retired. Thanks for posting.