Louyan

The local name is Tayan. Belongs to the order of birds, swift, swift family. Summer migratory birds. The top of the head, the upper body and the tail are pure black and brown, the top of the head and the upper back have metallic luster, the tail is forked, and the wing tip is long and sickle-shaped. Class I flying has a white narrow edge. The chin and throat are dirty and white, and the abdomen is black and brown with a white narrow margin. Young bird: Most of the feathers have white feathers, especially at the top of the head, the wing edge, the inner flight feathers, the upper wing feathers and the lower limbs. The iris is dark brown; Black mouth; The feet are purple and brown. Long summer moves in every year and leaves in late autumn. Food is full of flying insects. Nest in the tower eaves and wall joints at high places. The nest is made of soil mixed with stems, leaves, rags, shredded paper, etc., and padded with soft debris such as residual feathers. 2-3 eggs per nest, pure white.
Reprinted with attribution： https://cnlocality.com/(Chinese Specialty Products)