Workers at a special wildlife shelter clean a swan covered in oil near Hoek van Holland on June 30, 2018. /VCG Photo

Hundreds of swans, cormorants and gulls have been found contaminated after a tanker crashed into a jetty and around 200 tons of oil was spilled into the water at the port of Rotterdam, which is one of the biggest ports in Europe. /VCG Photo

Although a clean-up operation is underway, the problem is unlikely to alleviate because of the rising temperature, a spokesperson of The Port of Rotterdam said to the BBC. /VCG Photo