World Migratory Bird Day: 10 October World Migratory Bird Day is observed globally on 9 May or 10th October. The Day will celebrate the biannual migration. The aim of the day is to raise awareness of migratory birds and the importance of international cooperation to conserve them. This time the theme of World Migratory Bird Day 2020 is “Birds Connect Our World”. The theme highlights the importance of conserving and restoring the ecological connectivity and integrity of ecosystems that support the natural cycles that are essential for the survival and well-being of migratory birds.