Over 70% of Siberian migratory birds have stopped visiting Pakistan Dried up and contaminated water bodies, hunting and netting identified as major causes Welcome no more: Siberian migratory birds which made their way to Sindh every winter season, have largely stopped coming due to various reasons. Photo: file KARACHI: The number of migratory birds coming in from Siberia has declined drastically over the past three decades. Around 150,000 birds, including local and migratory waterfowl, were estimated to have landed at 12 aquatic 'stopovers', which is 70% less than in 2017-2018, according to a survey conducted during the winter season. The migratory birds usually arrive in Pakistan at the end of August and begin leaving in February. The birds are all gone by March.