The common name for several species of black birds in the Crow family and Crow genus. Also known as Lao Lu, his mouth is filled with joyful cries. It is the largest bird in the Passeriformes order, with a body length of about 50 centimeters. The whole body or most of the feathers are blackish black, hence the name. It mainly inhabits various forest types such as broad-leaved forests, mixed coniferous and broad-leaved forests, coniferous forests, secondary mixed forests, and artificial forests in low mountains, plains, and mountainous areas, especially sparse forests and forest edge zones. Most of them are resident birds. Strong clustering, with a group of up to tens of thousands of individuals. The behavior is complex and exhibits strong intellectual and social activities. Generally fierce in personality, rich in aggressive habits, often preying on eggs and chicks in waterfowl and wading bird nests. Omnivorous.