The only possible exceptions I can think of are fish(I imagine gills and mouth are not connected but don’t really know). I am excluding bacteria and viruses and I believe they don’t really breath(correct me if I’m wrong).
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When turtles hibernate they ‘breathe’ through their butt (cloaca).
Dolphins are the most classic example, having the blow hole.
Insects ‘breath’ through their ‘skin’
Dolphins can breathe thru their mouths tho.
There’s been some with damaged blowholes who have to resort to that.
What they do normally is like when you can “block” the connection of one or the other so air only goes thru one path. No idea how to describe that, or if other people can do it tho.
But if a dolphin needs to they can breathe thru their mouths just fine.
