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Sunday
Oct092011

Mallard - 1980s winter atlas

 

The BTO winter atlas showed that Mallards were present in most 10km squares during the winters of 1981-82, 1982-82 and 1983-84.

 

The darker the colour, the higher the relative total count for each 10km square.  The darkest blue represents over 239 birds both being squares containing estuaries.

 

Graham Rees

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