I'm wanting to get a few ducks for egg laying but NOT breeding... Except most ducklings aren't sexed so it's a gamble. How do you ensure you're getting all females? Or what do you end up doing with the males? It seems the only for sure way to get females is to purchase adult ducks which I'm fine with, but every time I find a deal on Craigslist someone else has gotten there before me. What are some suggestions for beginner duck owners only seeking egg collection?