Ear Breathing

Though we know about mouth and nose breathing we don't often think of ear breathing

Yet the sinus cavities are actually connected to the ears.  We can, by focusing our attention, notice tiny wafts of air near our ear passages when we breathe.

That's one reason why infections of one sinus often infect the others so rapidly. 

Tracing this out phylogenetically we understand that ears developed from ancient gills in fish.  Gills serve a central role in fish extraction of oxygen from water - breathing.