Seeing the birds flying in the sky, this question must have come to your mind that 'why can't we fly like birds?' Many of you might be thinking that maybe we don't have wings like birds, that's why we can't fly, but this is not the complete answer to this question because even if you attach artificial wings to your body, you will still not be able to fly. Then the question arises that how do birds fly with wings. So let's know the answer.
Actually the physical structure of birds is such that they can fly high in the sky. Their body and bones are very light.
Birds have air sacs in their body which further reduce their weight. Along with this, the muscles of birds are very strong as compared to their body weight. Due to strong muscles, birds can fly easily with their wings. This is the reason that the Big birds have bigger wingspan.
You must have noticed that the body of birds is flat and smooth and due to this type of physical structure, they are able to fly fast because they feel less resistance of air while flying. When a bird flaps its wings, it pushes the air down with its wings and rises upwards.
While on one hand the body of birds is so light and suitable for flying in the air, on the other hand the body of humans is very heavy in comparison to birds and to fly with such a heavy body, very big wings will be required. Despite this, there are no air bags in our body and the muscles of our body are not so strong that we can be able to fly with such big wings. This is the reason that even if we add artificial wings to our body, we still cannot fly.
You must have also seen that small birds can easily fly in the sky, on the other hand, heavy birds faces difficulty in flying, like peacock and hen. They cannot fly to a great height in the sky due to their heavy weight, while some birds are so heavy that they cannot fly, they can only walk on the ground. Like ostrich and penguin.
Similarly, we humans also cannot fly in the air due to our heavy weight and physical structure.
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