This video from the USA is called The Cornell Lab of Ornithology.
A video from the USA used to say about itself:
David Bonter, of the Cornell Lab of Ornithology and vice president of the Braddock Bay Bird Observatory, took us to Braddock Bay to learn how to band birds. Watch Bonter put a tiny aluminum bracelet on a swamp sparrow.
SOVON said this individual was very early and the other barn swallows will come back later from Africa.
This year is the Year of the Barn Swallow in the Netherlands.
Tree swallow photos: here.