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snorkack
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Birds are warm blooded, with intense metabolism.
How does an ostrich egg/chick breathe?
A mammal young of similar size has placenta. Air is actively breathed into mother´s lungs, then the blood is circulated to womb, where it is across a thin membrane from the young mammal´s placenta and circulating blood there.
Whereas an ostrich chick may have blood circulation and placenta inside the egg... but then there is a thick eggshell.
How does adequate amount of air to meet the intense metabolism of a big ostrich chick get through the thick eggshell by mere diffusion? Surely the skin of a a human baby is bigger, thinner and more permeable to air than the shell of an ostrich egg... if ostrich egg does not need mouth to inhale into lungs then what does a child need throat for?
How does an ostrich egg/chick breathe?
A mammal young of similar size has placenta. Air is actively breathed into mother´s lungs, then the blood is circulated to womb, where it is across a thin membrane from the young mammal´s placenta and circulating blood there.
Whereas an ostrich chick may have blood circulation and placenta inside the egg... but then there is a thick eggshell.
How does adequate amount of air to meet the intense metabolism of a big ostrich chick get through the thick eggshell by mere diffusion? Surely the skin of a a human baby is bigger, thinner and more permeable to air than the shell of an ostrich egg... if ostrich egg does not need mouth to inhale into lungs then what does a child need throat for?