The box shipped from the Philippines to the Beaver County post office was declared as containing T-shirts, The Beaver County Times reported.
Capt Thomas Christ of the Pennsylvania Fish and Boat Commission said a waterways conservation officer opened the box and found two venomous pit vipers, both dead.
Pit vipers find their prey and places to hide by sensing heat. There are more than 150 species of pit vipers. Officials didn't reveal the exact kind of snake, but said they believe the reptiles were alive when they were put in the box.
Mailing an animal is a federal offense, and in Pennsylvania, a permit is required to buy a snake, said Henry Kacprzyk, curator of reptiles at the Pittsburgh Zoo and Aquarium.
"On a legal end, it's not something that is a moneymaker," Kacprzyk said.
Kacprzyk also said that bringing an exotic snake from another country is dangerous, since hospitals carry antivenom antidotes for venomous snakes common to the United States but don't have antidotes for those from other countries.
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