The Sample Study on Avifaunal Diversity of East Sikkim was conducted by Lina Chatterjee in the month of May 2023 and the identification and data analysis was done by Nature Mates-Nature Club team. This dataset covers the areas Rongli, Padamchen and Zuluk which lies under Pangolakha wildlife sanctuary, Thambi and Nathang. The study area cover varied habitats like hilly terrain, village landscape, mountain landscape, high altitude lake, valleys, snow-capped mountain, alpine, sub alpine, temperate forest with rhododendron plants and oak,silver fir, juniper, pine trees and bamboo thickets. All the species are identified up to the species level. A total of 121 species of birds are recorded belonging to 39 families and 9 orders. Sampling method: Point Count Contacts 1.Name: Arjan Basu Roy Position: Secretary Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email: basuroyarjan@gmail.com Orcid : https://orcid.org/0000-0001-9872-3562 2.Name: Lina Chatterjee Position: Research Associate Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email: lina.linachatterjee@gmail.com Orcid : https://orcid.org/0000-0002-5626-5046 3.Name: Tarak Samanta Position: Research Associate Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email: taraksamanta995@gmail.com Orcid : https://orcid.org/0000-0001-6809-0549 4.Name: Sumana Besra Position: Intern Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email:sumanabesra1999@gmail.com Orcid : https://orcid.org/0000-0001-7222-2946 5.Name: Nivedita Sengupta Position: Research Associate Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email: niveditasngpta.ns@gmail.com Orcid : https://orcid.org/0000-0003-1085-7385 6.Name: Vijay Barve Position: Research Advisor Organization: Nature Mates-Nature Club Address: 6/7 Bijoygarh Kolkata-700032 Email: vijay.barve@gmail.com Orcid : https://orcid.org/0000-0002-4852-2567 Home page: http://www.naturematesindia.org/