Mallards gone, robin remains

Robin on  frozen pond

I just went back to check on those hearty Mallards that had found open water on a small section of the pond, only to discover they were gone. That section of the pond was now almost entirely frozen over. 

Another surprise awaited. A robin was hopping around that now icy patch. My question is, what is our red robin friend still doing in town?  If I had wings right now I'm thinking Texas would seem mighty inviting.