THE EXTENSION 15 
(2) Plant thickets of berry-bearing trees and shrubs 
along the roads or in waste places on the farm, or as orna- 
mental clumps on lawns. 
(3) Carefully protect the birds already occupying the 
premises. 
(4) Supply water for birds and food at times when 
they have difficulty in obtaining a sufficient supply. 
(5) Train and instruct the present and the rising 
generation of people regarding the usefulness and import- 
ance of birds. 
Biological Survey of North Dakota. 
During the past year a particularly important co-oper- 
ative arrangement was effected for the study of the North 
Dakota birds and mammals. The biological surveys con- 
ducted by the University,-the Agricultural College and Ex- 
periment Station, and the Bureau of Biological Survey of 
the U. 8S. Department of Agriculture, have been united in a 
co-operative plan to study and report upon the birds and 
mammals of the state with reference to life zones, their 
distribution and relation to agriculture. North Dakota is 
fortunate in being among the first of the states to secure 
the cooperation of the U. S. Bureau of Biological Survey 
with its incomparable methods and facilities for work in a 
thorough detailed study of the biological conditions of the 
state. Field work has been carried on actively during the 
past summer and is being continued together with the 
necessary laboratory investigations. 
OUTLINE SUGGESTIONS OF BIRD STUDIES WHICH 
MAY BE UNDERTAKEN BY INDIVIDUALS, 
SCHOOLS OR CLUBS. 
1. General procedure. 
Morning and late afternoon and evening are the most 
. favorable times of day to study birds. Learn by experi- 
ence the best localities in your vicinity for finding birds, 
but do not confine yourself entirely to these places. 
Move slowly and quietly and remain perfectly quiet, 
hidden in suitable places, at frequent intervals. Dress in 
plain colors which tend to blend with your surroundings. 
Learn to lure birds out into view by using the ‘‘squeak’’ 
made with the lips by producing a kissing sound on 
fingers or back of the hand. 
