answersLogoWhite

0


Best Answer

The main reasons involve the feathers and the skeleton. Special feathers are required for flight and the "Flightless Birds" have none of these special feathers. There is a unique part of the breastbone called the ridge. An extended part in the center of the breastbone is where the stronger muscles used for the wing movement are anchored. Finally the flightless birds have solid bones to transfer blood and oxygen through the bones themselves. Flight able birds have hollow bones to actually lighten the internal structure and weight of the bird. They also have much heavier blood vessels to transfer blood and oxygen to the limbs.

User Avatar

Wiki User

14y ago
This answer is:
User Avatar
More answers
User Avatar

AnswerBot

5mo ago

Not all birds have the physical adaptations necessary for sustained flight, such as large wings or strong breast muscles. Some birds have evolved to be flightless due to their habitat or lifestyle, such as penguins or ostriches. Flight requires a significant amount of energy and resources, so for some birds, being flightless is more efficient for survival.

This answer is:
User Avatar

User Avatar

Wiki User

8y ago

the weight of an bird
because of the way some birds are built their body structure wont allow them to fly

This answer is:
User Avatar

User Avatar

Wiki User

15y ago

2 reasons - one is the same as why you can't sit in a vacuum, the other is that to fly anything needs support from air.

This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Why can't all birds fly?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

Birds that cannnot fly?

penguins cant fly, and chickens cant propperly fly!


Why can some birds fly and some cant?

some birds are to big for their wings to make them fly


What birds have 7 letters and cant fly?

Penguin


What can hummingbirds do that most other birds cant?

Fly backwards


What are the differences between birds that can fly and birds that can?

well, a bird that cant fly has a larger body mass than one that can


Can birds fly with oil on there wings?

no they cant fly because it weighs down their wings


True or flase birds use wings and feathers to fly so all birds can fly?

To say that birds use wings and feathers to fly, so all birds can fly, would be false. Not all birds can fly. An ostrich is an example of a bird that cannot fly.


Yes birds can fly?

Most birds can fly. Not all.


Can pigeons fly backward?

Yes they do. Nearly all birds can walk. (Some birds that spend a lot of time on water find it difficult. Some, like Swifts, stay in the air.)


How do birds fly all the way to south?

Birds do not fly all the way to the southern hemisphere, they fly to the equator.


Do carnail the birds fly?

all birds fly xept penguins


Is a hen a brid?

yes, chickens are birds even if they cant fly