a list of rules for this Big Year, or for official Big Years?
Regarding "heard-only" many many birders do include them in their listings. It tends to be that people who don't tick "heard-only" think those who do are strange, and vice versa. My personal opinion is I have to actually see the bird (it is bird-watching, not bird-listening) - and how do you know if the bird you think the call is from is even correct? (Not so much in your home country where you are familiar with them, but when birding overseas). I am rubbish at bird calls anyway.
For this thread, nobody is/should be counting "heard-only". Captive birds don't count. Birds have to be from an established wild population - both native and introduced count (although the official American birding organisation is so slow-moving that there are established populations which are a source of minor disagreement here and there). A rescue bird in a box doesn't count, although it does once it has been released. Subspecies don't count as more than one listing. Hybrids don't count. Both the latter are interesting to mention though. The bird has to be alive!
I think that covers the thread "rules". It is all fun though so don't take it too seriously.
Oh, also made-up birds don't count. Just for anyone who is a stringer.
Thanks for writing this out fully, I like to know all of the "rules". I personally don't count heard birds, mainly because I can't recognise the calls but also (this is my excuse for not trying to recognise calls), what if it is a lyrebird mimicking something else? (Or any other mimic for that matter.)
Is it a case of don't take it too seriously on all years or just don't take it too seriously on years when Chlidonias is stuck in New Zealand and has no chance of coming anywhere near to winning?