The fly could walk without its wings because it can. The fly cannot
just fly every time because it will get tired in the end. And that is the
reason why it is given legs to walk. These legs are used to stabilize its footing
every time it lands on something such as walk along the ceiling. It has these
little tiny hairs that serves as an anchor for leverage. So if its wings were
to disappear, it can still walk but could not fly.
