This map illustrates the relative species richness of every tetrad in Wiltshire based on the number of species recorded in that tetrad during the breeding season shared fieldwork for Bird Atlas 2007-2011 (BTO 2013) and for Wiltshire Tetrad Atlas 2007-2012.
Between -1 and 88 species were recorded in each surveyed tetrad, with an average of 26.
Species count
Tetrads
1 - 30
654
71%
31 - 45
205
22%
46 - 60
39
4%
61 - 75
12
1%
76 or more
2
<1%
Not surveyed
3
<1%