Golden colored coral.

A bit larger then a baseball.

It came free from the leaf litter in which it was growing.

To me, it looks like 4 of those ducklings are not hers :o)
Another thought is that this is a hybrid bunch of chicks.  I read that Mallards and Black Ducks interbreed.  The hybrid when it breeds will have a more variable colored chicks. 
Taken with a 12x telephoto lens.  This detail was not visible to the naked eye.

Look at the 4 yellow once on the left.  They are a bit larger then the others.