Sentence examples for air sac system from inspiring English sources

They are the only animals with feathers, for starters, not to mention other specializations like a complex air sac system that keeps their bones light while making them especially efficient at drawing oxygen from the air.

"They might have had physical adaptations, like an internal air sac system, or they may have been seeking out shade in the hottest part of the day," he said.

The presence of a subcutaneous air sac system in at least some pterodactyloids would have further reduced the density of the living animal.

The syrinx depends on the air sac system in birds to function; specifically, it requires the presence of a clavicular air sac near the wishbone or collar bone.

Some of the iliac pneumatic sculpting, nevertheless, may have been associated with posterior extension of the cervical air sac system.

We also describe several pneumatized gastralia ("stomach ribs"), which suggest that diverticulae of the air sac system were present in surface tissues of the thorax.

While extensive air sac systems are a unique characteristic of saurischian dinosaurs, the clavicular air sac necessary to vocalize does not appear in the fossil record until the enantiornithines (one exception, Aerosteon, probably evolved its clavicular air sac independently of birds for reasons other than vocalization).

Among the air-breathing vertebrates, the respiratory system of birds, the lung-air sac system, is remarkably complex and singularly efficient.

A 2009 study showed that pterosaurs had a lung-air sac system and a precisely controlled skeletal breathing pump, which supports a flow-through pulmonary ventilation model in pterosaurs, analogous to that of birds.

The evidence for a lung-air sac system and a precisely controlled skeletal breathing pump supports a flow-through pulmonary ventilation model in pterosaurs, analogous to that of birds.

The wing bones are hollow, and the cavity in the humerus is connected with the air-sac system.