First Breeding Atlas
Species
Tetrads

0
7

1 - 39
119

40 - 49
102

50 - 59
84

60 or more
66
Second Breeding Atlas
Species
Tetrads

1 - 39
3

40 - 49
100

50 - 59
157

60 or more
118
New Breeding Atlas
Species
Tetrads

1 - 39
3

40 - 49
44

50 - 59
146

60 or more
185