4 times bigger in 4 days?
If you need any evidence the Peregrine Falcon chicks are growing up quickly, take a look at this brief video clip of the chicks getting fed this morning, 18 May, and compare it to the video captured and posted on 14 May that shows the same thing (scroll down a little bit to find this video clip).
They grow up so fast. It is so cool to see them so up close, and now that they are getting bigger to watch from the side view and see their little heads popping up. LOL