We've had a few folk asking about bonus points for rare subspecies - and quite frankly, we think it's a good idea!
Scoring for them is a bit complex though, and we reckon the only way to do it is on a case by case basis. So, here's a scenario...
If you see a chiffchaff, you get one point.
If you see a siberian chiffchaff, you get 2 points, as well as the point for the normal chiffchaff.
If you find a siberian chiffchaff, you can double your 2 points to 4 - and still have the 1 point for the original chiffchaff.
Simple. So, below is a list of the acceptable subspecies, the number of points they're worth, and the find bonus. Enjoy - and let us know which ones we've missed out....
Any 'genuine vagrant' canada goose - 3 points, double find bonus.
black brant - 3 points, double find bonus.
Borealis eider - 3 points, double find bonus. And it needs to have more than sails!
Scopoli's shearwater - 5 points, triple find bonus.
Yelkouan shearwater - don't even go there.
Kumlien's gull - 3 points, double find bonus.
American black tern - 5 points, triple find bonus.
dark-bellied barn owl - 3 points, double find bonus.
black-headed wagtail - 3 points, double find bonus.
Eastern yellow wagtail - 5 points, triple find bonus.
Any non-flavissima yellow wagtail - 2 points, double find bonus
black-bellied dipper - 3 points, double find bonus.
Siberian chiffchaff - 2 points, double find bonus.
Northern long tailed tit - 4 points, triple find bonus.
We know some of these may be full species now but they are not on our list in the scoring sheet so have been added here.
There are probably quite a few rarer examples that are not on that list - that doesn't mean we wont consider them if they do crop up though. There are also omissions such as scandinavian rock pipit and 'northwestern' wheatear, which I've deemed to common to worry about at half 9 on a thursday night!
So let us know if we've left anything out - and happy subspecies hunting!