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.
Walter Dean Myers, a beloved author of children's books, died on Tuesday following a brief illness, according to the Children's Book Council. He was 76. Myers's career spanned over 45 years, during which he wrote more than 100 books. Some of his best-known work includes Monster, a fictional 1999 account of an African-American teenager on trial for a felony murder in New York, and Fallen Angels, a 1988 novel about the Vietnam War. Myers was born in West Virginia but spent much of his teenage life in Harlem.