Farnboro John
Well-known member
Interestingly (or perhaps not!) I have a rule of thumb that on a day list you can see about two-thirds of what is available: so for UK 153/220 looks about right. Or at least my rule of thumb looks about right....
Factors that affect this include the size of area, how well known the locations of each bird in each location are, how consistently available those birds are, how good the weather is, how many hours of daylight.... obviously a list of what comes on your feeders each winter is likely to beat the rule of thumb while going blindly into an unknown area thrashing about hopefully will likely fall short. Across the UK, birders with a good idea of what they are doing, mostly working areas they know well, seem to have achieved to prediction despite pretty awful weather: I'd call that a good result!
John
Factors that affect this include the size of area, how well known the locations of each bird in each location are, how consistently available those birds are, how good the weather is, how many hours of daylight.... obviously a list of what comes on your feeders each winter is likely to beat the rule of thumb while going blindly into an unknown area thrashing about hopefully will likely fall short. Across the UK, birders with a good idea of what they are doing, mostly working areas they know well, seem to have achieved to prediction despite pretty awful weather: I'd call that a good result!
John