Just like us, birds take in air through the nostrils or mouth.
Because streamlined body cuts air and allows birds to move swiftly in air.
Birds fly in air. They use the air to fight gravity. When air travels faster along the upper wing than the lower wing, the air force down is less than the air force up -- really helps most birds. Gravity affects birds.
Penguins are birds and like all birds they get oxygen by breathing air.
some birds take rest.
1.For birds to be able to take flight or fly high enough and still obtain enough oxygen, the birds have air sacs. 2.(Air sacs are membranaceous receptacles which communicate with the cavities of the respiratory organs passages, and can through be filled with air.) I really hoped this helped, now remember the answer to the question is number 1. The definition of air sacs is number 2.
Air pollution makes air thicker. Birds' wings need thicker air to help them fly. Polluted air helps bird fly better and find more food, nesting grounds etc. Air pollution is extemely helpful for birds.
Birds move in the air by flapping their wings to generate lift and propel themselves forward. On the ground, birds walk or hop using their legs and feet.
They are like giant birds flying in the air.
Birds lungs are called lungs but birds also possess air sacs for help in respiration .
the birds take a winter holiday because it will be cold in their place.
The air.
when it flies