What are the features of the location and structure of the muscles of birds?

Birds have a musculoskeletal system. It consists of a skeleton and muscles. The muscles of birds cover various parts of the body and are located under the skin. In flying birds, the pectoral muscles are most developed, since they are directly involved in flight. Also, the pectoral muscles are the largest in the body of birds. Muscles are important for breathing. They help to change the volume of the chest. Thanks to this, the brain is ventilated. Muscles help move the bird’s neck and other parts of the body.