Table 1. Breeding attempts since modern records began in 1981.

Only data after 1990 were used in this study because data between 1981 and 1990 were incomplete. Note that for some clutches no copulations were recorded, and that fertility reported here is apparent fertility determined from candling; not true fertility from microscopic analysis. This is the full data set; some of these clutches were excluded from the fertility model. See text for further details.

Year	Island	Clutches	Recorded copulations	Fertile eggs	Infertile eggs	Hatched	Fledged
1981	Rakiura	2	0	4	0	4	3
1985	Rakiura	3	0	3	6	2	0
1990	Hauturu	2	2	2	1	2	0
1991	Hauturu	4	3	6	2	4	2
1992	Whenua Hou	4	1	9	2	6	1
1993	Hauturu	2	3	1	3	1	0
1995	Hauturu	2	2	0	5	0	0
1997	Whenua Hou	6	6	7	5	4	3
1998	Maud	1	1	3	0	3	3
1999	Pearl	8	8	11	5	8	6
2002	Whenua Hou	24	34	42	25	26	24
2005	Whenua Hou	10	16	11	15	6	4
2008	Whenua Hou	5	12	10	0	8	6
2009	Whenua Hou	28	52	54	18	36	33
2011	Anchor	1	0	2	0	0	0
2011	Whenua Hou	8	13	14	4	11	11
2014	Hauturu	1	3	3	0	2	2
2014	Whenua Hou	7	14	6	9	5	4
2016	Anchor	22	32	32	38	21	15
2016	Hauturu	2	4	1	2	0	0
2016	Whenua Hou	20	31	30	19	26	20
2019	Anchor	37	60	56	67	42	37
2019	Whenua Hou	43	64	63	66	44	36
Total		242	361	370	292	261	210