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.

More than 12,000 chicks at a Delaware distribution center were found left in a USPS truck for more than three days.

The U.S. Postal Service is investigating how 12,000 chicks were left inside a tractor-trailer at a Delaware mail distribution center.