He is listening intently for worms. Yes, I heard last year of experiments that showed that robins can detect worms just by hearing them.
I don’t know if there are any to be caught yet but these birds always arrive within days of the first bare patches even though there may still be a layer of ice between them and the first worms. They were spotted a couple of weeks ago a few miles south, but as we are on top of a ridge, north of Lake Ontario, our climate is a few degrees cooler so a few weeks behind the lake shore in the spring.
The robins don’t eat anything we put out for food, so they will go hungry for several days at least, unlike this blackbird.
We were in England last week and were delighted to hear the song of the English blackbirds, which are very musical. I was sad to hear, though, that 80% of the nightingales in England have gone and an important nesting site is facing destruction.