Table 6. Occurrence of Marked Unemployed Birds Over the Runw 
ays 
February 14 to March 18 (Symbols indicate areas in 


Figure 15) ie 
Un- 
marked 
_GB _GS BO _BN 00 RH Area _ Total 
Number marked 400 100 1000 250 1000 300 0 3050 
Est. percent marked 
in each area 7 8 18 4S iy re a. 
Number observed* 189 6 124 92 6 1 re) 158 
No. represented by ob- 
served birds (est.) 2700 75 690 204 270 2 Lhokee = 533 %% 
Est. percent contri- | 
bution to unemployed 
bird hazard 50 a5 13 4 5 27 100 
* See note previous table. 
** Est. total unemployed birds less estimated number from marking areas. 
*** Total birds counted over runways less number of nesting birds. 
The only correlation found between time of day and appearance 
of any segment of the population over the runways was a statistically 
significant increase in unemployed birds from the residential area during 
the period between 11 a.m. and 3 p.m. It is possible that low wind speed 
in the early morning and late afternoon may be a factor restricting the 
flying of albatrosses from the sheltered residential area. 
Conclusions 
1. About half the birds over the runways are nesting birds; 
the other half are unemployed birds. 
2. Since population estimates show a ratio of 5 nesting 
birds for each unemployed bird on land at a particular time, an un- 
employed bird is roughly five times as great a hazard as a nesting bird. 
3. Approximately two-thirds of the birds over the runways 
(nesting and unemployed birds alike) come from within 750 feet of the 
runways. 
4, Nesting birds from the residential area make up less than 
one-half of one percent of the nesting birds flying over the runways 
(or less than one-quarter of one percent of all the birds over the 
runways). 
5. Unemployed birds marked in the residential area comprise 
roughly 5 percent of the unemployed population over the runways (or 
about 2.5 percent of the total population over the runways). At the 
30 
