The spine of birds, except for the cervical and part of the tail, is motionless. The vertebrae of the lumbar, sacral and part of the caudal regions merged into a single bone – a complex sacrum. Together with the bones of the pelvis, it serves as a solid support for the lower limbs on which the bird walks. In addition, the motionless spine does not sag during flight, which contributes to maintaining the streamlined shape of the bird’s body.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.