In the beautiful Castle Waardenburg in southern Gelderland, there has been a swift colony for years. Every year around the end of April/beginning of May, the birds fly back from Africa to the Netherlands to breed there. And when the breeding season is over, they fly back to Africa en masse.
And so this year, for the first time, we can all witness how things are going in one of the 120 breeding chambers at Waardenburg Castle! If you want to be a witness to this, please visit the website of the Dutch Society for the Protection of Birds:
https://www.vogelbescherming.nl/beleefdelente/gierzwaluw
