If you really want to blow Bob's mind on the bird thing, not only do birds have lots and lots of air sacs, their respiratory system also contains two breaths
at any one time
I'm getting flashbacks to Ornithology and having to diagram all of this on tests...
Anyway, for an animal with really high physical demands, and the really high metabolism that requires. They don't have a diaphragm, either. It's pressure from their wing muscles on the upstroke and downstroke that cycle air through, which necessarily means that the faster wing beats result in faster breathing.
On top of that, though even ratites (emu, cassowary, ostrich, etc.) have at least some hollow bones, there is a group of flighted
birds that do not
They're so incredibly adapted for diving, their bones are solid to decrease buoyancy. Just before taking the plunge, they flatten down their flight feathers, forcing any air out from their down. Their legs are also attached to their body exactly where you'd want a motor on a boat to make it as fast and maneuverable as possible - on the very, very back. This renders them physically incapable of walking on land, which leaves them doomed if they mistake a wet parking lot or highway at night for a lake or river, unless a human renders assistance.
....Also, now I'm disappointed in myself for not at least guessing on Who's That Noisy? I thought it sounded really similar to the 'croaking' sound that certain catfish make via stridulation...