Thanks PWMK for your further information for the records!
Ha, from the bird records, it looks as if it's an IQ question -
1) 23rd October, 1974
2) 31st October, 1976 (2 years?)
3) 29th October, 2006 (30 years?)
4) 24th October, 2009 (3 years?)
5) Oct, 20??
In this case, the logic might be another 30 years for the 5th record, i.e. 2039?! and then 6th one 4 (3+1 years) years after, i.e. 2043?!
Oh no please!!!
(just daydreaming, don't believe it...)
BTW, from 1974 report, 23Oct74 was just the 2nd record?! Then for the first one was...?
Very interesting...