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Vertebrates, Fishes, Amphibians, Reptiles and Birds
Air Sac
Air sac definition: An air-filled space that moves air through a bird’s lungs.
Related Terms
Amniotic Egg
Carapace
Cartilage
Ectotherm
Endoskeleton
Endotherm
Feather
Gill
Jacobsons Organ
Lateral Line System
Operculum
Oviparous
Ovoviviparous
Plastron
Sternum
Swim Bladder
Tetrapod
Tympanic Membrane
Vertebrate
Viviparous
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