Answer:
They come at night without being called and are lost in the day without being stolen. What are they?
I am easy to see, but no one likes looking at me. Without me, there would be no you. What am I?
A single syllable do I claim black was my most famous name; Fetal to mortals here below thousands have I slain in a single blow.
I am known for my natural tuxedo and marching. What am I?
I stink in living but when dead smells good.
Give it food and it will live, give it water and it will die.