https://dxnest.com/yen-tinh-ch....e-loai-thuong-hang-1
https://dxnest.com/yen-tinh-ch....e-loai-thuong-hang-5
Birds are fascinating creatures, gliding through the sky with a degree of freedom we can only dream of. They are also a source of protein and nutrition, and they're celebrated in many cultures as symbols of prestige. In Asian traditions, birds' nests have been a high-end culinary delicacy for centuries, and their soup is believed to promote healing. Bird's nests are made of the saliva of certain species of fast-flying birds. The birds build the nests in limestone caves, an