Muscles that lift the wings of birds?

Most bird species are adapted to flight. For this they have wings, feathers, a lightweight skeleton and various adaptations of the internal structure of the body. They have well-developed muscles that are responsible for flight. The main muscle is the pectoralis. It is the largest muscle in the body of birds. It allows you to control the wings. Some birds must flap their wings continuously to maintain flight, and some are capable of gliding in the air. It all depends on the size of the bird’s wings, its weight, body shape and some other parameters.