Bài soạn Dong vat hoc 03

1 Class Aves BIO 2215 Oklahoma City Community College Dennis Anderson 2 3 Class Aves • Feathers • No teeth • Flexible long neck – One occipital condyle • Scales on legs • Bones with air spaces • Endothermic • Four chambered heart 4 Adaptations for Flight • Honey combed bones – Air cavities – Less weight 5 Light Weight Skeleton • Frigate bird • 7 foot wing span • 4 ounce skeleton 6 Adaptations for Flight • Enlarged sternum – Flight muscle attachment • Long neck – balance 7 11-25 Cervical Vertebrae 8 9 Pygostyle 10 Skull • Most bones fused • Much lighter than reptile or mammal skull