Sunrise Silhouette of Cormorant Fisherman, Yangshuo County, China - stock photo

Cormorant fishing is a traditional fishing method in which fishermen use trained cormorants to fish in rivers. To control the birds, the fishermen tie a snare near the base of the bird's throat. This prevents the birds from swallowing larger fish, which are held in their throat, but the birds can swallow smaller fish. When a cormorant has caught a fish in its throat, the fisherman brings the bird back to the boat and has the bird spit the fish up.