Mammal bones are less dense and thicker, because they don't have to deal with the stresses of flying. The bones of a bird are thinner, and have a dense structure of internal struts that make the bone exceptionally stiff and strong.
bird bones are lighter
Bird bones because feathers are very light and the bones just depend on the type of bird.
Birds bones are particularly lightweight. The skeletal formation is light and strong with the exception of Frigatebird wherein its bones are only half the weight of its feathers.
bones can be strong and healthy !!!!!!!!!!
Tobi says: Bird's bones are hollow to help them fly,obviously to reduce weight when they fly. Human bones, on the other hand, are not hollow. We need strong bones to do the things we do, eg: walking, skipping, jumping etc...
Bird Bones in the Bughouse was created in 2004-10.
It has hollow bones to let it be lighter, streamlined body shape to reduce air resistance and strong muscles to flap their wings.
regular bird bones
The kiwi is a bird and has a spine (backbone).
Human bones are thicker and denser; bird bones are thinner, hollow and mean less weight on the bird.
Birds do have bones.