Two elephants drink water in Rotterdam Zoo, the Netherlands, on July 30, 2026. (Xinhua/Shao Haijun)

A polar bear stands in the cave in Rotterdam Zoo, the Netherlands, on July 30, 2026. (Xinhua/Shao Haijun)

Two sea lions play in Rotterdam Zoo, the Netherlands, on July 30, 2026. (Xinhua/Shao Haijun)

Visitors look at an elephant in Rotterdam Zoo, the Netherlands, on July 30, 2026. (Xinhua/Shao Haijun)

Visitors watch a sea lion swim in Rotterdam Zoo, the Netherlands, on July 30, 2026. (Xinhua/Shao Haijun)

A polar bear swims in Rotterdam Zoo, the Netherlands, on July 30, 2026. (Xinhua/Shao Haijun)