Fed both robins!
There's been a half-tame robin hanging around recently that was obviously feeding another one. Depending on the person, he'd get pretty damn close, following any digging or other activity which might turn up anything edible (one plot-holder has him diving on turned-over soil while it's still on the spade he's holding), filling his beak & flying off. I've thrown cockchafer larvae a few feet to where he can conveniently pick them up, & he's grabbed 'em while I watched. We assumed Mrs R was sitting on eggs, & he was feeding her.
Late this afternoon Mrs B & I paid a brief visit to the allotment. He arrived, & Mrs B turned over some ready-to-use compost for him. He started fishing around - then another one joined him! I've always thought of 'em as fiercely territorial, but they seemed totally amicable. No. 2 was slightly slimmer & definitely more cautious of us, & only took food near us when no. 1 was already there. Looked very much like Mr & Mrs, collecting grub for the youngsters.
They love ant larvae. Presented with a load from a nest under black plastic, Mr stuffed his beak. There was a row of little white grubs sticking out of the side when he flew off.