Photo: Yolo Audubon

Breeding Bird Atlas

The Yolo Breeding Bird Atlas was initiated to try and establish exactly what birds were breeding where in the county in order to help establish conservation priorities, both for the chapter and for other interested parties.

We have a mailing list devoted to this project. To subscribe to this list, or to read the list archives, go to

Data management will be facilitated through the BBA Explorer, hosted by the USGS Patuxent Wildlife Research Center.

Overview map of BBA Grids

Breeding Bird Atlas instructions

Habitat Definitions

Field Card

Table of Breeding Bird Atlas Block Maps

A1 B1 C1 D1 E1 F1 G1 H1 I1 J1 K1            
A2 B2 C2 D2 E2 F2 G2 H2 I2 J2 K2 L2 M2      
  B3 C3 D3 E3 F3 G3 H3 I3 J3 K3 L3 M3      
      D4 E4 F4 G4 H4 I4 J4 K4 L4 M4 N4 O4  
      D5 E5 F5 G5 H5 I5 J5 K5 L5 M5 N5 O5  
      D6 E6 F6 G6 H6 I6 J6 K6 L6 M6 N6 O6  
        E7 F7 G7 H7 I7 J7 K7 L7 M7 N7 O7  
          F8 G8 H8 I8 J8 K8 L8 M8 N8 O8 P8
          F9 G9 H9 I9 J9 K9 L9 M9 N9 O9 P9
          F10 G10 H10 I10       M10 N10 O10 P10
                          N11 O11 P11
                          N12 O12 P12
                          N13 O13 P13
                          N14 O14