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Publication 52 - Hazardous, Restricted, and Perishable Mail >
5 Perishable Matter > 52 Animals > 524 Disposal
Any mailpiece containing live animals that cannot be delivered to the addressee or returned to the sender within 72 hours (for live, day–old poultry) or within the delivery period marked on the parcel (for other mailable animals) must be disposed of immediately. For safety reasons, dispose of mailpieces not marked with a delivery period when it reasonably appears the articles cannot be delivered or returned in a viable condition. See POM 691.52 for disposal information. Also see 742.3 for the disposition of mailpieces that are refused by air carriers.