This TIL struck like a laxative!

Every spring, chicken hatcheries mail out newborn chicks en masse. I've gone to my post office and heard chirping coming from the back many a time.

Babies wouldn't be much different. Just need bigger air holes in the box.

It's weirdly hilarious that they allow day-old birds, and adult birds, but apparently nothing in between.

So you can order chicks by mail, but you can't return them by mail (unless birth + packaging + USPS shipping, including delivery + return packaging + delivering return package to USPS for return mailing all takes < 24 hours, total, I guess)