act as the functional units of the respiratory system by passing oxygen into the body and carbon dioxide out of the body. Finally, the muscles of respiration, including the diaphragm and intercostal muscles, work together to act as a pump, pushing air into and out of the lungs during breathing.
The Ivory-billed Woodpecker (Campephilus principalis) is an extremely rare member of the woodpecker family, Picidae. It is officially listed as an endangered species, but by the end of the 20th century had widely been considered extinct until it was apparently sighted along the Cache River in Arkansas in 2004 and 2005.
There are some small subpopulations living in protected areas, and the parrotlets' are protected under Brazilian law; however, threats remain for this species. The vinaceous-breasted Amazon (Amazona vinacea) is an endangered parrot. It is native to parts of Brazil, Argentina and Paraguay.he orange-bellied parrot was listed as critically endangered in 2005. It is the only Neophema parrot species to be listed as such under Australia's Environment Protection and Biodiversity Conservation Act. The kakapo (Strigops habroptila) is critically endangered.