Jane Turner
Well-known member
I just altered the way store my bird records so now I can look at totals summed by quarter months. I intuitively thought this was the case, but now my data show that Willow Warblers are arriving earlier. It also shows that in recent years Spring records are predominating and that there is a distinct double peak observable - I assume relating to firstly British breeding birds then later Scandinavian ones.
The upper graph is pre 1985 and the lower on is post 1985...
Whatever the cause, the effect is observable!
The upper graph is pre 1985 and the lower on is post 1985...
Whatever the cause, the effect is observable!