A dolphin plays with a ball at Primorsky Aquarium, on Russky island outside the Far Easrtern port of Vladivostok, Russia, September 4, 2018. Primorsky Aquarium is the third lagest aquarium in the World and it is included into the Russian Academy of Sciences.

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Dolphins perform at Primorsky Aquarium, on Russky island outside the Far Easrtern port of Vladivostok, Russia, September 4, 2018. Primorsky Aquarium is the third lagest aquarium in the World and it is included into the Russian Academy of Sciences.

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A trainer and a walrus perform at Primorsky Aquarium, on Russky island outside the Far Easrtern port of Vladivostok, Russia, September 4, 2018. Primorsky Aquarium is the third lagest aquarium in the World and it is included into the Russian Academy of Sciences.

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A trainer and a walrus perform at Primorsky Aquarium, on Russky island outside the Far Easrtern port of Vladivostok, Russia, September 4, 2018. Primorsky Aquarium is the third lagest aquarium in the World and it is included into the Russian Academy of Sciences.

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A walrus swims at Primorsky Aquarium, on Russky island outside the Far Easrtern port of Vladivostok, Russia, September 4, 2018. Primorsky Aquarium is the third lagest aquarium in the World and it is included into the Russian Academy of Sciences.

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A visitor takes pictures of a stingray at Primorsky Aquarium, on Russky island outside the Far Easrtern port of Vladivostok, Russia, September 4, 2018. Primorsky Aquarium is the third largest aquarium in the World and it is a part of the Russian Academy of Sciences.

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Visitors take pictures as a diver feeds a stingray at Primorsky Aquarium, on Russky island outside the Far Easrtern port of Vladivostok, Russia, September 4, 2018. Primorsky Aquarium is the third largest aquarium in the World and it is a part of the Russian Academy of Sciences.

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