This 2013 video from Dutch conservation organisation Natuurmonumenten is about a black-bellied plover couple. In winter, they are in West Africa. In summer, in the Arctic. During their long migration journeys, they need to stop. Stop at places like the sandbanks in the Oosterschelde estuary in the Netherlands.
However, there is a problem for this plover couple, and for many other migratory birds and for Oosterschelde resident seals: since the storm surge barrier was built between Oosterschelde and North Sea, water currents have changed. This means the sandbanks get smaller and smaller; leaving less space for animals.
Conservationists made a plan to stop that: add a lot of sand to the sandbanks, making them bigger again.