I found two nests yesterday that both had 2 eggs on Saturday but the nests lay empty on Sunday. Sure enough today there was new egg in each nest. What could have happened?
1. The nest could have been predated. A predator got into the nest and ate the eggs.
2. Another female could have chased away the first female, tossed the eggs of the first female and then laid her own egg the following day.
I'm not really sure which scenario happened but it brings up how aggressive house wrens can be. House wrens will take over a nest from other birds like the eastern bluebird. They chase away the owners of the nest and toss the current eggs from the nest. They will stab the eggs with their beaks and literally throw them out the door. A couple times I have found the eggs laying at the base of the bird box with little holes in them.
However, this time, I didn't see any eggs close by to be able to draw a firm conclusion. Any thoughts?
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