![Which of the following is a characteristic feature of the bones of birds?Four chambered heartPneumatic bonesLarge eyesHollow nerve cord Which of the following is a characteristic feature of the bones of birds?Four chambered heartPneumatic bonesLarge eyesHollow nerve cord](https://search-static.byjusweb.com/question-images/toppr_ext/questions/386453_369201_ans.jpg)
Which of the following is a characteristic feature of the bones of birds?Four chambered heartPneumatic bonesLarge eyesHollow nerve cord
Birds have pneumatic bones and they lack bone marrow, then, what synthesis the RBC, Leukocytes and other components of the blood in Aves?
![Chapter 19 and 20 Notes, Birds and Mammals. Characteristics of Class Aves Forelimbs designed for flight in most birds. Epidermis is covered in feathers, - ppt download Chapter 19 and 20 Notes, Birds and Mammals. Characteristics of Class Aves Forelimbs designed for flight in most birds. Epidermis is covered in feathers, - ppt download](https://images.slideplayer.com/25/8107812/slides/slide_12.jpg)
Chapter 19 and 20 Notes, Birds and Mammals. Characteristics of Class Aves Forelimbs designed for flight in most birds. Epidermis is covered in feathers, - ppt download
![Biology 2e, Biological Diversity, Vertebrates, Birds | OER Repository - Affordable Learning LOUISiana Biology 2e, Biological Diversity, Vertebrates, Birds | OER Repository - Affordable Learning LOUISiana](https://s3.amazonaws.com/microsite-louis-prod/media/courseware/openstax/m66592/Figure_29_05_02.jpg)
Biology 2e, Biological Diversity, Vertebrates, Birds | OER Repository - Affordable Learning LOUISiana
![Ultraviolet light illuminates the avian nature of the Berlin Archaeopteryx skeleton | Scientific Reports Ultraviolet light illuminates the avian nature of the Berlin Archaeopteryx skeleton | Scientific Reports](https://media.springernature.com/m685/springer-static/image/art%3A10.1038%2Fs41598-019-42823-5/MediaObjects/41598_2019_42823_Fig5_HTML.png)
Ultraviolet light illuminates the avian nature of the Berlin Archaeopteryx skeleton | Scientific Reports
![Pulmonary air-sac system in a bird.a, Latex injection (blue) of the... | Download Scientific Diagram Pulmonary air-sac system in a bird.a, Latex injection (blue) of the... | Download Scientific Diagram](https://www.researchgate.net/publication/7730012/figure/fig4/AS:267546427392026@1440799447993/Pulmonary-air-sac-system-in-a-birda-Latex-injection-blue-of-the-pulmonary-system-in-a.png)