For the past several days, the birds have been trying to build a nest, I think. Daryl has tried to start the construction with the remains of a spray of millet, a stem which he finally managed to wedge into the side of the cage at the top corner.
To help him in his architectural quest, I put into the cage a tray of cut pieces of stems from an old physalis plant all of which I found on the floor after a few hours. Daryl was apparently unable to get them to lodge into the place which he had intended for them.
Now I am wondering how I can help him to progress in the construction of a nest.