Newly hatched chicks survive on their internal yolk sack up to 3 days I've read. I've had birds delayed up to 48 hours but they were juveniles, not chicks. 12 hours is nothing. Still, be prepared to lose a chick or two. Not all chicks survive even in ideal situations. Sad but true. My Dominique chicks I ordered through my local feed store who orders all his stock from Privett. All 3 of the Dom chicks I brought home survived but when they were a year old I did lose one Dom hen to heatstroke when our temps got to 122 degrees one day!!! Good luck with your new babies! What breed are you getting?
I'm waiting on Blue Australorps, Crele Penedesencas and assorted Sumatras. I was mostly worried about the added stress of just sitting around in a box. Maybe I'm just a helicopter mom after all.
A couple months ago I ordered some chicks through Hoover, which is supposed to be in Iowa. After they were sent and i got my tracking number I found out they were actually coming from Minnesota! Being in AZ if I'd known that I wouldn't have ordered. Iowa is far enough and i already don't like ordering from places that are too different from my own climate. According to tracking they left out Wednesday night... like late night. Which I thought was weird. They got to Phoenix like 1 am Friday morning and just barely missed the truck that comes out my way, so basically sat in Phoenix for 24 hours until the next truck coming to my office! They finally showed up late Saturday morning and all were dead. I'm pretty sure if they were sent out earlier on Wednesday I would have gotten live chicks. I was very upset to say the least.
MS isn't a difference between north/south, they're just going sideways from NM, and weather is still pretty mild right now, so I'm betting you're babies will be ok.
I'm sure y'all are right. I'm still nervous. They still haven't moved. At this point I'm expecting them all to be expired. I had bad feelings about ordering chicks instead of eggs.