Visitors watch a manta ray at the aquarium of Temaiken Biopark, in Escobar city, 50 km from Buenos Aires, capital of Argentina, on July 27, 2016. (Xinhua/Martin Zabala)
Visitors watch a manta ray at the aquarium of Temaiken Biopark, in Escobar city, 50 km from Buenos Aires, capital of Argentina, on July 27, 2016. (Xinhua/Martin Zabala)