When you add a bird to your list it's interesting to know how significant it is. How many other people have recorded the species? Am I the first? BUBO Listing now tells you if your species is a good record, compared to other listers!
When you add a species to a list you may get a message depending how significant it is, based on how many other "similar" lists (of the same type, e.g. location, life/year, self-found) have already got the species on it. Messages aren't displayed if it is relatively "common" on other lists.
If you are entering several records via batch edit, don't worry as the message isn't obtrusive and you can ignore it and keep ticking away.
With pan-species listing, we also integrate with the NBN Atlas to tell you how significant your record is compared to nationally available records.