Thousands of chicks found abandoned inside a postal service truck for three days have gone to new homes, according to the Delaware shelter that had cared for them, with the last batch picked up on Thursday morning.

About 4,000 birds were found dead in the truck, and 10,000 others were stranded there for three days, state officials said. The hatchery that shipped the chicks said it did not know why the shipment had never made it to its destinations.

The chicks were left abandoned due to a "misdirected" shipment, according to the Delaware Department of Agriculture.