It doesn't add up

Aaron, Charlie and I went to Tryon, NC this weekend along with my mom and her dog. We were there to visit and to celebrate my nephew's 7th birthday. We went bowling.

Zac, the birthday boy

Before we left on Friday afternoon I made sure Kathy and Eleanore had enough food and water for the weekend. I also packed a carton of eggs to take to Tryon, leaving us just a few in the fridge. But, I figured, 2 birds, spring weather, an egg a day... 4 eggs upon our return.

I was mistaken. 1 egg. 1. Just one. I don't understand. These are young birds. Seemingly content birds. At the very least I would have expected 2 eggs. Maybe they are lonely...