This video is called Kentish Plover (Charadrius alexandrinus).
Richel is a breeding ground for ringed plovers, Kentish plovers, little terns, and other birds. It is also an important resting place for gray seals. At high water, the sand bank is a flood refuge, where many species of wading birds rest and, while cleaning their feathers, wait until they can forage at low tide.
Wildlife rangers on Richel have a blog (in Dutch). It is here.