Wood pigeon eating ash leaves

In late evenings in June I noticed wood pigeons arriving in nearby ash trees and eating the leaves. I guessed they were having a late night snack before going to bed. They usually appeared around 9pm, and sunset was just over an hour later. These trees seemed to be a popular roost for late evening until the birds flew off to bed.

I posted the video on youtube and someone replied saying he had seen a similar thing but at 5 am.

5 pm in July

8.45 pm in June