I am merry creature in pleasant time of year, As in but certain seasons, I sing that you can hear; And yet I'm made a by-word, A very perfect mock; Compared to foolish persons, And silliest of all folk.
A metal neither black nor red,
as heavy as man's golden greed.
What you do to stay ahead,
with friend or foe or arrow and steed.
Many things can create one, it can be of any shape or size, it is created for various reasons, and it can shrink or grow with time.See answer
Select a pack of riddles and try to solve it in an interesting way.
This riddle appears in the following downloadable PDF files: