I heard the distressed calls of a Mallard, couldn't make what was going on at first. The female Mallard calling and hissing. Several times it got attacked by one of the two male Mallards and driven away, but kept returning to the ducklings. There were moments I thought she wanted to kidnapped others' babies. There are two males and a female in the other party.
Finally she was left in peace with the ducklings. I saw racoons nearby, hope all the ducklings will make it.
Brave Mama!