The U.S. Customs and Border Protection announced Friday that agents found the skull last week when they conducted a routine x-ray scan of the luggage, which had been inadvertently separated from owners during transit. The scans revealed the skull of a young dolphin in one of the bags.

STOWAWAY CAT FOUND IN LUGGAGE AT JFK AIRPORT DURING THANKSGIVING RUSH GOT TO ENJOY HIS HOLIDAY

According to the CBP, importing or exporting marine mammals is prohibited. The skull was turned over to U.S. Fish and Wildlife Service investigators.