This map illustrates the species richness in all tetrads in Wiltshire that were surveyed during the winter season fieldwork for Birds of Wiltshire (Wiltshire Ornithological Society 2007).
Between -11 and 48 species were recorded in each surveyed tetrad, with an average of 4.
Species count
Tetrads
1 - 30
403
44%
31 - 45
39
4%
46 - 60
1
<1%
61 - 75
0
0%
76 or more
0
0%
Not surveyed
472
52%