Maybe they were just back from spring migration from Africa?
This 2011 video says about itself:
«The headscarf girl» – «Das Kopftuchmädchen» is a Swiss filmlet about a Muslim girl facing negative social repercussions for wearing the headscarf. Its aim is to deliver a condensed picture how especially young, smart Muslim girls suffer from the ever growing wave of Islamophobia in Switzerland since the adoption of the minaret ban in 2009.
Translated from Dutch NOS TV today:
Girl (14) maltreated in Emmeloord after refusing to take off headscarf
A 14-year-old girl was wounded by two boys in Emmeloord last Wednesday after she refused to take off her headscarf. The victim was injured. That’s what the police announced today.
When the girl came home from school last week, two boys demanded her headscarf to be removed. When she did not do that and said that the boys had to keep their mouths shut, the two jumped off their bikes.
The girl was pushed from her bicycle and kicked against her head and back. Then the perpetrators went off, writes Omroep Flevoland.
The victim went home first after the abuse and then went to the hospital. She turned out to have multiple bruises and a concussion.
The police are looking for the boys. They are about 18 years old. People who know more can contact the police.
This 2014 video says about itself:
Courtship and mating of Little Tern (Sterna albifrons). Filmed in the Netherlands.