Listen outside, For crickets and birds, Down at the rink, A discouraging word

In realms where shadows dance and play, A circle of stones marks the day. No hands to glide, Yet time won't hide, This solar wizard's on display.

In the hold of the ship, where cheese be the lure, A snapper awaits, with a promise unsure. Ye critter of whiskers, beware the sly thief's snare, For the treasure ye seek, tis not quite fair.

I flip up in rain or when engines need care, I shadow your face with a fold of warm wear. I lift from a car when the engine’s no good, A cover in cloth or in metal - I quietly stood.

Tenebrous and no coward, she watches upward and downward. What am I?