This video from the Netherlands is called Sandwich Tern chick preening.
From the Norfolk Coast National Trust blog in England:
21 June 2015
Over the past two weeks, we have seen an influx of late-arriving Sandwich Terns. Today, a total of 314 new nests were counted on the tip of Far Point alongside Common and Little Terns. This year, we are continuing our research into the factors affecting Little Tern breeding success, which involves the use of trail cameras on nests.
Pingback: Sandwich tern research on Texel island | Dear Kitty. Some blog
Pingback: Young birds news from Vlieland island | Dear Kitty. Some blog
Pingback: What young Sandwich terns eat | Dear Kitty. Some blog
Pingback: Good bird news from Poland | Dear Kitty. Some blog
Pingback: Dutch Ameland Sandwich terns now in Namibia | Dear Kitty. Some blog
Pingback: Little grebes and goosanders | Dear Kitty. Some blog