In Zaandam, Netherlands, a man walking along a street when he noticed something strange about one tree on that road. He got his camera out and started to film it, not knowing what could happen. Instantly, he saw over a hundred birds flying away from the tree simultaneously. There were so many of them that they actually made the tree bend when they were sitting on it. These birds normally travel in big groups in nature to feed and protect each other before a long winter migration journey, which can be amazing to witness.