Well, contrary to my expectations, they are all grown up now.
With their odd pigeon sibling.
And I found a non-native invasive species in the park (Regent’s) too. I was worried it was a bird corpse, but remembering Colette’s maxim “look for a long time at what pleases you, and longer still at what pains you…” I looked longer.
And realised it was a terrapin. Naughty.