Year of the woodswallow?

["Green" <>]

Can someone tell me where do the ratios of White-browed to Masked reverse? Up 
North it's mostly Masked with smaller numbers of White-browed, here it's the 
reverse. What happens in the middle? Are there evenly balanced flocks? Or is 
there just a line? Weird!!!!
By the way we have had flocks of woodswallows turn up over the last week and a 
half in the South East of SA.

Bob Green
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