What wins (in your opinion) in keeping DUCKS vs. Keeping GUINEAS ? I can get some free ducks to take care of bugs, ticks and worms in my yard ... I know Guineas are good for this to, but can't seem to easily find any keets for sale in my area right now ... so I'm trying hard to make the right decision here, but if I DO go with the free ducklings ... I won't be getting any guineas this year, it has to be one or the other (so hubby says). So Duck vs. Guineas ... let me hear your opinions please !