What Kind Of Eggs Are These?

Do you know what kind of eggs these are? Look real close now. Are you sure you've guessed right? They are duck eggs--well except for that round dimpled one in the center. I'm not sure who laid the golf ball.

Our lone duck, Wilma has been busy laying all of these little eggs recently and fluffing her nest, safely tucked under the peony bush against the house. We recently lost her mate, Butternut, so we're not sure if these are eggs that will hatch, but there is a very good possibility, so we've been keeping an eye on them. We suppose she found the golf ball in the yard and decided it must have belonged in her nest. I wonder what she'll think when it's the only egg not to hatch. Poor little duck.

Here's Wilma, just coming back from a swim in the canal. We'll both keep you posted on any hatching news. Quack!