Avens, a Bad Omen, and Tiberius

Stubbing your toe is always bad t happens in the aeneid as well. So we've got, at th break of day, there came to the house the man who bought the birds with which auspices are taken and threw food before them. But the birds would not come out of the cage, with the exception of one, though. And even the one that came out would not touch the food, but raises its left wing, left. First mention of left always, always bad luck.