Bird bones are light because they are hollow.
Birds are very lightweight boned animals. :)
im not sure if they have an extra air sack but if they do its because birds fly very high and they is not much oxygen up where they fly, plus i do know they have a light bone structure.
VERY! It makes your blood cells
Removes the phosphorous. It makes them very brittle.
Homozizyges, is a illness that you can catch from birds, and makes you very sick and/or depressed. :)
Because of how they skinny they have skinny legs to keep them very light
It uses its curved wings. The whole of a bird's body structure makes it very light. It also loses its weight by pooing almost everytime. So it will be lighter and is able to fly more easily. Some birds' body structures are already too big and they cannot fly. Well the reason birds CAN fly is because they have hollow bones. There hollow bones makes them lighter. They also have a KEEL bone which is used to keep the bird upright so they don't fall over during flight. and pooing doesnt make any difference with the birds weight!!
Yes, it makes it very... uhh..."lame"...
vestigial organs such as a tail bone in humans and a hip bone in whales. also, the skeletal structure of wings of birds, flippers of whales, and hands of humans are all very very similar in structure.
Because its bones are very light and its bone structure is ideal for very fast running
Calcified bones are hard but not really solid. Spongy bone is hard with tiny holes in it. Periosteum is thin but very strong. The other name for it is outer membrane, it helps to rebuild bone cells. The last is cartilage. It is strong material that holds two bones together and allows them to glide over one another. Skull iz also a very strong bone.
The hot air, inside of it is very light and makes the balloon rise up.