Table 2.

Colony status, size, and survey precision for updated estimates (N = 398 sites).

	Number of sites	% of total
Location verified by satellite imagery	364	91.5
Current colony status
Present	265	66.6
Presumed present	68	17.1
Absent	21	5.3
Presumed absent	2	0.5
Unknown	42	10.6
Colony size (most recent estimate)
1–10	19	4.8
11–100	51	12.8
101–1000	109	27.5
1001–10,000	142	35.8
10,001–100,000	40	10.1
100,000 +	6	1.5
Precision of current estimate (n = 283)
Nest count
N1 (± 5% accuracy)	114	40.3
N2 (± 10%)	20	7.1
N3 (± 10–15%)	8	2.8
N4 (± 25–50%)	5	1.8
N5 (nearest order of magnitude)	119	42.0
Chick count (C1; ± 5%)	14	4.9
Adult count (A4; ± 25–50%)	3	1.1