World Migratory Bird Day 2021: Birds, rivers, gusts of wind do not stop them, you must have heard that yes, birds keep moving from one country to another for their life or breeding according to the changing seasons. There is no habit of staying in one place. They live their freedom to the fullest but it is not easy to travel such a long way at the time of migration, so we humans also need to help in their migration. That is why World Migratory Bird Day is celebrated twice a year, recognizing the need for the protection of migratory birds and their habitats.