Data on Red-tailed Tropicbirds from Howland Island 
SIC # 
# 1 
# 2 
# 3 
# 4 
# 5 
# 6 
# 7 
# 8 
# 9 
# 9 
# 10 
Year 
1963 
1963 
1963 
1964 
1964 
1964 
1965 
1965 
1965 
1965 
1965 
1966 
1966 
1966 
i 960 
Month 
March 
July 
Oct. 
Feb. 
July 
Oct. 
Feb. 
May 
Sept. 
Oct. 
Nov. 
Feb. 
Feb.27- 
-Mar 
May 
Dates 
19-22 
6-8 
8-12 
22-24 
9-13 
1-3 
18-22 
16-20 
14-21 
22-24 
4-7 
Maifel 
26 
2-4, 8-9 
5 
Estimated population 
4o 
4o 
3 
100 
75 
10 
50 
2 
1 
2 
2 
Est.breeding pop. 
— 
-- 
2 
# of nests ctd. 
16 
— 
34 
33 
2 
16 
1 
-- 
— 
— 
1 
$ of nests/eggs 
3 
_ 
18 
6 
... 
15 
1 
. _ 
— . 
— — 
1 
# of nests/young 
13 
-- 
16 
27 
2 
1 
__ 
—„ 
— 
— 
— 
/ of nests/eggs 
18.8 
i 
— 
52.9/o 
18 . 2 / 
-- 
93-8/ 
.. 
_ 
_ 
100.0/ 
/ of nests/young 
81.2 
1° 
-- 
47.1/ 
81.8/ 
100.0/ 
6.2/ 
— 
-- 
-- 
4 of adults band. 
-- 
12 
— 
67 
16 
1 
9 
_ 
_ 
_ 
_ 
_ _ 
# of young banded 
— 
— 
13 
-- 
10 
24 
2 
-- 
— 
-- 
— 
-- 
-- 
-- 
Total-banded 
— 
-- 
25 
-- 
IT 
40 
3 
9 
-- 
— 
-- 
— 
-- 
.. 
# of returns 
-- 
— 
-- 
-- 
4 
6 
-- 
12 
ff of br.bird returns 
6 
— 
7 
Total handled 
3 
Tot. ad. handled 
— 
— 
12 
— 
71 
22 
1 
/ est.pop.handled 
/ knw.br.pop.handl. 
/ 
1966 
Aug. 
14-18 
1966 
Sept. 
15-20 
1966 
Oct. 
14-17 
1966 
NoV. 
18-21 
1966 
Dec. 
9-12 
1967 
Jan. 
1967 
Feb. 
* 
1967 
Apr. 
1968 
July 
— - V “—“ 
75 
54 
85 
62 
50 
22 
20 
18 
16 
2 
2 
8 
8 
50 
12* 
330 
112 
23 
28 
13 
10 
8 
1 
4 
6* 
56 
8 
15 
7 
21 
2 
11 
2 
8 
2 
6 
1 
4 
6* 
b 
34.8 / 
65-2 / 
25 . 0 / 
75-0/ 
15.4/ 
84.6/ 
20.0 / 
80 . 0 / 
25 . 0 / 
75.0/ 
100 / 
52.7/ 
47.3/ 
10 
7 
9 
— 
-- 
5 
5 
1 
1 
1 
T 
- 15 
9 
24 
10 
28 
16 
12 
3 
3 
35 
1 * 
38 
38 
28 
3 
3 
3 
3 
6 
1 
1 
_ 
59 
5o 
