Actually this is what happens when you ship juveniles and adults, or a private seller ships chicks. Drop off the box at USPS then FedEx or another carrier picks them up at the sorting facility and delivers them to the destination sorting facility. That causes issues too. USPS can't track them while FedEx has them. The box gets bumped for dry ice, doesn't arrive on time, and you have no idea where the birds are. In some parts of the country sellers have to call before shipping to make sure FedEx has a dry ice free flight available.That is sadly the only option. They are the only ones that can legally ship life poultry. Places like FedEx, UPS, etc. will not even take them in their SmartPost option where they move the package from the shipper to the nearest post office and then release it to the USPS for delivery.