804 
THE WILSON JOURNAL OF ORNITHOLOGY • Vol 124. No. 4. December 2012 
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0.15 m 
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Fabric-covered 
wood frame 
Net bag 
Weight 
FIG. 1. Modified hoop net design for trapping nesting Chimney Swifts. 
2 his if no bird was caught. The trapping duration 
of failed attempts depended on swift activity at 
the chimney, where, if birds were making many 
close approaches, I removed the net after 1.5 hrs 
of unsuccessful trapping; only in cases where 
there was little adult activity was the net left for 
the full 2 hrs. I deferred further trapping at that 
site to another day if no bird was caught by the 
end of the second hour. The 2-hr maximum in- 
place time was to minimize disruption to nestling 
provisioning (Bull and Beckwith 1993). 
Data Analysis .—I calculated trapping success 
as a proportion ol sites at which trapping was 
attempted each year (site success; N 2m = 8, 
^2011 - 10) and as a proportion of placements 
(placement success; N 2m) = 13. M 0II = 22) 
where a site could have the net in place numerous 
times each year before a bird was caught. I tested 
lot differences in placement success between 
yeats and between chimneys grouped by color 
with Fisher s exact tests at an alpha level of 
0.05. All analyses were performed in R 2.12.2 
(R Development Core Team 2011). 
RESULTS 
I caught individual Chimney Swifts at seven of 
eight nest sites (88%) at which trapping was 
attempted in 2010. and five of 10 nest sites (50%) 
in 201 I . I attempted trapping in both years at six 
sites with the remaining six sites targeted in only 
I year. There was no significant difference in 
placement success between years (Fisher's exact 
test. /’ = 0.28) or between chimneys grouped by 
color (Fisher's exact test. P = 0.14). " 
I caught birds at five of the seven successful 
Mtes in 2010 on the first visit, while the remaining 
two sites required a second visit before a bird was 
tiapped. Three of the five successfully-trapped 
