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According to Wikipedia (19 Sep 11), all the bones in a bird are semi-hollow: they're filled with structural supports (like organic struts and trusses) and, often, air pockets. But, there are exceptions: some Flightless Birds (such as penguins, ostriches, emus) have only solid bones.
Other answers:
None of them are hollow. However, they are much less dense than the bones of mammals. Mammals have a thick, heavy bone structure that is almost solid to support the body weight of each creature on land against gravity. Because bird skeletons must be light enough to fly, the inside of each bone is filled with long, narrow marrow supports that gives the bone both strength and a lightweight structure. However, this also makes bird bones much more fragile than those of mammals. If the bones were to be completely hollow, there is a good chance that they would be so brittle that even flight itself would be dangerous.
All of them are hollow but there are a few birds that don't have hollow bones, like the emu or penguin.
What else can I help you with?
Are birds the only animals with hallow bones?
Most birds -- and all birds that fly -- have semi-hollow bones. Most reptiles, however, do not.
Do penguins have hollow bones?
No, penguins have solid bones like other birds, which helps with their diving abilities and survival in the water. Hollow bones are found in flying birds to reduce weight for easier flight.
Birds are the only thing that has?
Birds are the only things that have feathers and hollow bones.
What structural adaptations of the birds help them to fly easily?
Hollow bones, light body, large lungs and compact skeletal system.
Are birds bones weak?
No, birds' bones are not necessarily weak. In fact, bird bones are often designed to be hollow or semi-hollow, which makes them lightweight yet strong enough to support flight. This adaptation allows birds to be agile and fly efficiently.
What is warm blooded and has wings and hollow bones?
Birds are the only creatures that are warm blooded and have wings. Not all birds, however, have hollow bones - most flightless birds do not have hollow bones.
Do flightless birds have hollow bones?
no they do not have hollow bones. this is because they are flightless and god just made them that way♥ ♥
Are birds the only animals with hallow bones?
Most birds -- and all birds that fly -- have semi-hollow bones. Most reptiles, however, do not.
What are the bones birds have?
Birds have hollow bones to help them fly.
Hollow bones help birds to?
their bones are hollow to make them lighter, and more legible for flight. if they had solid bones they wouldn't be able to fly as fast, high or as maneuverable as they are now. Hope this helped! (:
What is in side a birds bones?
Birds bones are hollow. That is why they can fly, because they are so light because of their hollow bones. x)
Do bird have hollow bones?
Yes all birds have hollow bones though reptiles dont
What animal has hollow or partly hollow bones?
birds have hollow bones to help them fly
Do sparrow's have hollow bones?
yes, sparrows have no bones
Is a birds skeleton hollow?
Birds have some bones in their bodies that are "hollow." These are called pneumatic bones, and they help birds breathe when they are in flight. The bones of the pelvic girdle, some ribs, the humeru,s and the femur all are pneumatic.
How are all birds wings alike?
They all have feathers and are made of hollow bones.
What are vertebrates with hollow bones?
Birds.
