New Year Quiz

I've been surveying the birds in the 10x10km square near where I live for a while now. Habitats inc the Teifi and Dulas valleys below Tregaron all the way up to the open moorland and forestry blocs above there and Llanfair. I've now completed 23 of the 25 "winter" tetrad visits and looking through my notes I see that just 5 species have occurred in every one of those 23 tetrads. Any idea which they may be? The winner will receive a stale mince pie and the pot of out of date cream that I just found in the back of the fridge.