Migratory birds, including the Ruddy Shelduck and Great Cormorant, have begun arriving at Arunachal Pradesh's D'Ering Wildlife Sanctuary. Wildlife officials noted their arrival in the Borguli and Sibiyamukh ranges, later than usual this year, starting in late December. The sanctuary, situated between the Siang and Sibya rivers, provides essential ecological conditions for these winter visitors and supports globally threatened species.