What are the USPS rules for shipping chickens in terms of heat?

[Hennypen]

Someone wants to buy some of my chickens but they'd have to be shipped. It's hot outside. Can/will the USPS ship birds in this heat?

 

[easttxchick]

They're not supposed to, but a lot of times, in these rural areas, they depend on the person shipping to know and they'll take them anyway.
I won't ship another bird until October, at the earliest. Too risky.

 

[pips&peeps]

Generally they stop taking birds when it gets over 85 degrees, my post office will take my chicks though on most days.

But per the regulations, it is up to their discretion.

9.3.11 Acceptance
The USPS does not accept any shipment of animals that the USPS reasonably believes cannot reach its destination in a viable condition. Such a determination is based on factors including the expected temperatures (weather conditions) while the shipment is in the mail; the types of vehicles on which the shipment is to be transported; the expected transit time; and the types of packaging used for protection against suffocation, crushing, and handling.​

 

[Oregon Blues]

If you ship them now and they die from the heat, is the buyer going to want you to replace them at no cost to themselves?