Some people are surprised to learn that it is still possible to mail day-old live poultry.  But the USPS regulations specify the conditions, and the Postal Service regularly delivers live chicks.  Since they need no water or food for the first few days, they have a surprisingly high survival rate.

The service was new in 1918, as featured in this item from the October 1919 issue of Popular Science.  Surprisingly, you can’t buy live chickens on Amazon.  You can, however, buy fertile eggs and the incubator.  But as both the 1919 article and the Amazon reviews make clear, the survival rate doing it this way is not as good.