Indian hill myna
On a recent quick trip to South Florida, I was shown two new, but currently uncountable, life birds. The Indian hill myna, and the chestnut-fronted macaw are established exotics here in SoFla. We saw them nesting and making babies, so we know they are establishing their North American populations, however neither species is currently on the North American Bird List as an accepted, countable species.
So I am tucking these sightings away for the day when some enterprising ornithology student decides to do a study on these species for his/her PhD thesis. We're calling these species "Bankable Lifers" until they are countable.