Birders! The masked red bird mentioned at the end of Cobblestone & Birds is now identified. When I have questions like this henceforth, I will simply walk next door and ask Joachim and Bärbel. They are far ahead of me on many things, I have learned.
They first encountered this species in Guadalajara and photographed it there. It is a siskin flycatcher, more often referred to as a vermilion flycatcher, species pyrocephalus rubinus. In Spanish, mosquero cardenalito. Now I know its German name, too. Rubintyrann. All I had to do was encounter Joachim this morning while I was trying to photograph mine again.
As I mentioned before, all of Joachim and Bärbel's photographs are of a professional quality. For birders to see their photographs of this bird and others, go to this one of Joachim and Bärbel's many galleries. Click on the next to the last thumbnail at the bottom.
Come to think of it though, I will bet that for birders, this bird is old hat.