Powered flight.
yes
Speed.
random motion
Birds fly every day. If you have seen a unusually large amount of birds flying, they could be migrating birds passing your area.
It seemed impossible to be able to soar across the sky like birds during the Renaissance era and he wanted to defy that.
they use it to steer their body in the sky
The birds are flown high in the sky under their own power.
astronomy
Motion whose direction and speed changes continuously is called random motion. Eg:a fish swimming in water , a flying butterfly ,a bird flying in the sky,etc.
If I understand you correctly, you are saying that a bird flying in the sky does not have a shadow. If this is the case, it is not true. Birds do have shadows. I have noticed shadows of birds flying overhead, like a hawk, for example. I believe, that for small birds, the shadows are probably so small we just don't notice them.
The birds flying in the sky do not cast their shadow on the earth because the umbra is absent and the penumbra is too large and too faint that it is not visible as the distance of the earth is very large from the bird.
yes, there is fesies(poop) flying above us because most birds drop fesis from the sky when they are flying