In the past hundred years, in the area of Dali Lake, the long-term drought has greatly shrunk the grassy wetlands and turned them into saline-alkali land  Grassy wetlands are places where ducks, geese and other kinds of waterfowl nest and hatch
However, with the continuous shrinkage of wetlands, the average decline rate of the population of red sesame ducks in this area is much lower than that of swans
The strengthening of this environmental protection measure has slowed the average decline in the number of red sesame ducks, swans and other species of waterfowl.