' □ 1-15 tay 
O — 16-31 t-hy 
O ~ 0 birds 
0 = 1-10 " 
O =11-25 " 
O =26-50 " 
O =51-100 " 
0 = 101 - 500 " 
© 
0 
0 
0 
© 
© 
© 
