black-necked
1.After a nature reserve for black-necked cranes was established on the middle reaches of the Yarlungzangbo River, the number of black-necked cranes wintering there has increased each year, accounting for about 80% of the earth’s total number of black-necked cranes.
2.The original design of the railway would have it passing through the black-necked crane nature reserve on the middle reaches of the Yarlungzangbo River. After many discussions, the designers decided to select a circuitous route via Yangbajain, to avoid disturbing the birds.

