The tiniest egg

Something caught my eye in the barn the other day.
On the inside of the garage door, I could see something that looked like a nest:

I watched it for a couple days but never saw any activity around it.
Finally, I needed to pull the nest down because I wouldn't be able to open that big door without dumping the nest's contents:

and, besides, I really wanted to see what was inside:

Can you see the hair in the bottom? That would be courtesy of either Beau the donkey or Dolly llama:

Sadly, this little egg will not ever hatch and I never did see the bird who laid it:

But, as I have a tendency to do, I needed to do a size comparison.
From left to right, here is a normal-size chicken egg from my girls (2.3 oz), a ridiculously small chicken egg one of my hens gifted me with the other day (.3 oz!) and the tiny barn egg (wouldn't register on my scale):

The tiny barn egg and a quarter:

Here's my little red farm truck with my normal sized chicken egg:

the ridiculously small chicken egg:

and the tiny barn egg:

For additional perspective, here's this:

What it that, you ask?

Roxy's such a good sport.