We have a 12 Troyer gourd setup, been up for a few years and just in the last couple of weeks I started checking the gourds thanks to this forum. I didn't make a record of my first check - the idea was to get the martins used to me messing with their condos and to familiarize myself with the difference between a martin nest and all others. Yes, I've not done my due diligence until now

Anyway, I numbered the gourds and had a peek inside. I found one sparrow nest complete with three or so eggs, I pulled it out and set the gourd sparrow trap (yes, I realize the common wisdom is to not pull out a nest.)
So I have six gourds with at least four or five eggs each

Gourds:
1 - martin nest, no eggs
2 - martin nest with eggs
3 - martin nest, no eggs
4 - martin nest with eggs
5 - martin nest, no eggs
6 - martin nest, no eggs
7 - martin nest with eggs
8 - martin nest with eggs
9 - martin nest with eggs
10- martin nest, with eggs
11- martin nest, no eggs
12- sparrow nest with eggs (removed and gourd trap set)
John
JJ Ranch Exotics
Texas Hill Country