Replica of a 65-million-year-old skeleton of a plesiosaur marine reptile is displayed in the museum hall at the Bernardino Rivadavia Natural Science Museum in Buenos Aires, Argentina, on Dec. 19, 2018. The fossil is found in Cretaceous period rocks submerged in Lake Argentino at the foot of the Andes mountains.The fossil is nine meters long with each fin measuring 1.3 meters. (Photo/Agencies)
Replica of a 65-million-year-old skeleton of a plesiosaur marine reptile is displayed in the museum hall at the Bernardino Rivadavia Natural Science Museum in Buenos Aires, Argentina, on Dec. 19, 2018. The fossil is found in Cretaceous period rocks submerged in Lake Argentino at the foot of the Andes mountains. The fossil is nine meters long with each fin measuring 1.3 meters. (Photo/Agencies)
Visitors admire replica of a 65-million-year-old skeleton of a plesiosaur marine reptile at the Bernardino Rivadavia Natural Science Museum in Buenos Aires, Argentina, on Dec. 19, 2018. The fossil is found in Cretaceous period rocks submerged in Lake Argentino at the foot of the Andes mountains. The fossil is nine meters long with each fin measuring 1.3 meters. (Photo/Agencies)
