why do the birds flying high do not cast their shadow on the surface of the Earth - Physics -

Question

why do the birds flying high do not cast their shadow on the
surface of the Earth?

Ajay · Accepted Answer

Hi Brinda!
As the bird is flying high, the penumbra
formed by it will be so large that the shadow will not be visible
If the bird is flying near to the surface of Earth, the shadow will
be visible
Cheers!!

why do the birds flying high do not cast their shadow on the surface of the Earth?