Hen Harrier: 1980s winter atlas

The BTO winter atlas showed that Hen Harriers were present in a third of Pembrokeshire 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 3 birds recorded per day.

Graham Rees