Are magpies beneficial or harmful?

Magpie is one of several long-tailed birds of passeriformes, also known as magpie. What we are most familiar with is that Darkmouth magpies (common magpies) are almost all over the world except Central and South America and Oceania. In China, there are 4 subspecies except grassland and desert areas, all of which are local resident birds. Magpie looks like a crow, but it has a long tail. Body length is 435 ~ 460 mm, except the abdomen and shoulders, the whole body is black and has a blue-green metallic luster; The wings are short and round; The tail is much longer than the wings and is wedge-shaped; The mouth, legs and feet are pure black. Male and female feathers are similar in color. The young bird's feathers look like an adult bird, but Kuroha is partially dyed brown, and its metallic luster is not obvious. Habitat in broad-leaved forests, foraging in the wild and fields, especially near residential areas. In addition to forming small groups in autumn, most of them live in pairs all year round. It's loud. Omnivorous, it preys on small animals such as locusts, crickets, cutworms, scarabs, moth larvae, frogs, steals eggs and chicks from other birds, and also eats fruits, grains and plant seeds. Nesting on tall trees, chimneys and transmission towers, both men and women. The bird's nest is spherical and woven from dead branches. The inner wall is filled with thick soil and lined with grass leaves, cotton wool, animal hair and feathers. Every year, new branches are added to the old nest to repair it. Magpies have been sexual partners for many years. Each nest lays 5 ~ 8 eggs. Eggs are light brown, cloth brown and grayish brown spots. Female birds hatch eggs, and the incubation period is about 18 days. The chicks are late-maturing, and their parents can only leave the nest after feeding them for about 1 month. Red-footed falcons often compete for nests of magpies or bald-nosed crows. Magpie has been a popular bird since ancient times. There are many beautiful myths and legends about it, and people regard it as a symbol of good luck. It has played a positive role in eliminating pests and cleaning up the garbage in the field.