This map illustrates the species richness of every tetrad in Wiltshire based on the number of species recorded in that tetrad during the breeding season fieldwork for Birds of Wiltshire (Wiltshire Ornithological Society 2007).
Between 5 and 72 species were recorded in each surveyed tetrad, with an average of 32.
Species count
Tetrads
1 - 30
424
46%
31 - 45
393
43%
46 - 60
88
10%
61 - 75
10
1%
76 or more
0
0%
Not surveyed
0
0%