A Strange Appearance

I can't decide whether it is stranger to see a single appearance of a bird long absent, or a long absence by a usually common bird. In either case, today I spotted a lone American Robin. And it has been a long run of months since I've seen a single individual here. I'm accustomed to seeing migratory movements: our summer Robins go south and northern Robins come here (I usually find great flocks of them out east) But for me...none. So what was the story with the laggard? No storms existed to blow it off course. No other signs exist of other Robins. I'm fairly certain I've not missed this bird previously. It remains one of those oh-too-tantalizing mysteries for the amateur observer. I'm hoping it sticks around and takes up the suet pursuits in which all the earlier Robins engaged. Much yet to see...