Table 12.--Progress of Sooty Tern Killing Program on 
Sand Island, 1958. 

Rounds 
Colony Date Number killed ammunition expended 
1 3 Jun. 2,500 
1 4 4,500 
1 5 1,600 
1 6 1,400 
1 9 1,200 
1 10 1,100 
1 11 800 
1 12 1,000 
1 17 100 
Subtotal 14, 200 4,360 
2 23 Jun. 3,000 
2 25 3,000 
2 27 1,000 
2 30 300 
2 2 Jul. 100 
Subtotal 7,400 510 
Total 21,600 4,870 
D. Conclusions and Recommendations 
(1) No factual evidence has been presented to indicate a 
need for eliminating sooty tern populations on Sand Island as long as 
jet planes are not used. Although they are frequently struck by air- 
craft, they are too small to damage piston=driven aircraft. No cases 
of damage to aircraft resulting from sooty tern strikes were reported | 
during the two seasons of study. 
44 
