Migratory birds make voyages each year that stretch over thousands of miles because of their inability to survive the harsh winters. Around 230 species of birds migrate to Sri Lanka from December to March. They mainly come to mangroves in Jaffna, Mannar and Bundala. Migratory birds play several essential and indispensable roles in the ecosystem as they reside and travel through. They are a source of recreation for millions of bird watchers, help in pest control, and act as an indicator of global changes.  But nowadays they are endangered due to some activities caused by humans such as destroying their habitats, clearing of mangrove areas, disposing garbage and widening of roads. According to some statistics, the percentage of migratory birds which visit SriLanka have been gradually decreasing over the past few decades.