The double crowned cormorant (Phalaclocoraxauritus) is a bird species in the family Scomorantidae of the order Characiformes. Its beak is strong and long, with grooves on both sides of the upper beak and a hook at the tip, making it suitable for pecking at fish; There is a laryngeal sac at the base of the lower mouth; Small nostrils, completely concealed in adult birds; Expose your eyes first; Slender neck; Two wings of moderate length, lacking a fifth secondary feather; The tail is round and hard straight, with 12-14 tail feathers; The feet are located at the back of the body; Short tarsus without feathers; Flat toes, long hind toes, connected by webbing. After diving, the feathers are soaked and need to spread their wings to dry in the sun before they can fly. Residing on islands, coastlines, and swampy areas. They mainly eat fish and crustaceans.

Egret is a medium-sized wading bird belonging to the family Egret in the order Characiformes. There are 13 species of birds in the genus Egret, among which the Big, Medium, Small Egret, and Snow Egret are all white in body feathers, commonly known as Egrets, and have a medium body size. Distributed in the Yangtze River Basin and other areas of China, as well as in Africa, central and southern Europe, West Asia, Central Asia, East Asia, Southeast Asia, Oceania and other regions. They inhabit lakes, ponds, estuaries, and other water bodies in low altitude areas, often gathering in small groups and active in shallow waters or riverbanks. They often forage in the water during the day and fly back to the forest to rest at night. White egrets prey on small fish, shrimp, frogs, mollusks, insects, and also peck at small amounts of plant seeds.