Can't help but weigh in a little here. Common names are supposed to be that - common names. The name commonly applied to the animal. It's all very well to have official lists for birders, but let's take the Australian "jabiru" as an example. There are tens of thousands of Territorians and North Queenslanders, non-birders but who live where the bird does, and have for generations, who call it a jabiru. Then there's several dozen birders in the same area, who now call it a black-necked stork (despite its iridescent green neck!), as do visiting birders to the tune of a few hundred per year. It seems that the most common name for the bird, and the historical one, is jabiru. Sure, there's a "real" jabiru in South America. There's also a real bandicoot in India, and as Tim said, real sparrows and buntings in Europe. We're seeing more guides come out with true common names -the name the bird is called by the local indigenous population, who may be the only ones that ever see the thing apart from a few birders. Who should tell a local what to call the animal they've known for years, and generations? There's been this push over the last 20 years, due primarily to the rise in birding, to standardize common names, so we know exactly who they are, without confusion, and their relationships to other species elsewhere. Seems like the definition of scientific taxonomy to me. If that's what you want, fine, use the scientific names, that's what they're there for. If you want to ask a local what a bird is, or want to encourage people to take an interest, then use the common name familiar to them. Don't expect them to adopt a new "common taxonomy" to fit in with someone else's hobby. Or we get absurdities such as changing "nankeen kestrel" to rufous kestrel, and in one swoop destroying (thankfully only temporarily) the historical connection to Australia's early days. Or we suddenly get the appearance of a hobby in Australia, where none had flown before. Even worse are those "common" names constructed from the scientific, resulting in a common name reflecting an old and no longer relevant generic name. To say nothing of being a jawbreaker.
So that's my rant.
Cheers,
Pemburung