Give an account of Migration in birds. Add a note on the problems faced by them during migration. (UPSC 2018, 15 Marks, )

पक्षियों में प्रवास का वर्णन करें। प्रवास के दौरान उनके द्वारा सामना की गई समस्याओं पर एक टिप्पणी जोड़ें। (Give an account of Migration in birds. Add a note on the problems faced by them during migration.)

Give an account of Migration in birds. Add a note on the problems faced by them during migration. (UPSC 2018, 15 Marks, ) EN ह function dochangelang(val) { if (val != "") { window.location = val; } }

Give an account of Migration in birds. Add a note on the problems faced by them during migration. (UPSC 2018, 15 Marks, )