Carla with four eggs, 25 March 2025, 7:10am (photo from the National Aviary falconcam at Univ of Pittsburgh)

25 March 2025

Just when we’d thought Carla was done with egg laying Sara Showers saw 4 eggs at the nest this morning before dawn. We were surprised because peregrines usually lay an egg every other day. This one took twice as long and is 4 days after the prior egg.

It took a bit of searching the archives to find when it happened. Here is the moment at 4:34am.

Carla laid her fourth egg of the season at 4:34am, 25 March 2025 (photo from the National Aviary falconcam at Univ of Pittsburgh)

Video of the few minutes before and after the egg appeared.

So my question about incubation is answered. It began, as it should, after the next-to-last egg.