The air sacs of birds extend into the humerus (the bone between the shoulder and elbow), the femur (the thigh bone), the vertebrae and even the skull. Birds do not have a diaphragm; instead, air is moved in and out of the respiratory system through pressure changes in the air sacs.Muscles in the chest cause the sternum to be pushed outward. This creates a negative pressure in the air sacs, causing air to enter the respiratory system.n mammals, only one respiratory cycle is necessary. Respiratory cycle of a bird. 1  During the first inspiration, the air travels through the nostrils, also called nares, of a bird, which are located at the junction between the top of the upper beak and the head.
Midnight (Koontz novel) Midnight is a novel by the best-selling author Dean Koontz. It was published in 1989. The book is a cross-genre novel. It includes aspects of suspense, science fiction, love story, and horror.
read more. After Midnight is a rock song written by J. J. Cale. The laidback boogie feel of After Midnight is a prime example of Cale's signature style. Though Cale wrote the song, it first appeared on Eric Clapton's eponymous 1970 album, and Clapton's recording remains the most well known version of the song.Cale had written the song and released a demo version in 1966.fter Midnight is a rock song written by J. J. Cale. The laidback boogie feel of After Midnight is a prime example of Cale's signature style.