Table 1:
Clutch size, hatching and fledging success for Carnaby's Cockatoo at six study locations
| Location | Year | No. of nests | No. with one egg | No. hatched (%) | No. fledged (%) | No. with two eggs | No. hatched (%) | No. fledged (%) | Clutch size (mean ± SD) |
|---|---|---|---|---|---|---|---|---|---|
| Coomallo Creek | 1970 | 20 | 2 | 2 (100) | 1 (50) | 18 | 30 (83) | 16 (44) | 1.9 ± 0.3 |
| 1971 | 61 | 15 | 6 (40) | 5 (33) | 46 | 74 (80) | 29 (32) | 1.8 ± 0.4 | |
| 1972 | 61 | 13 | 8 (61) | 6 (46) | 48 | 64 (67) | 30 (31) | 1.8 ± 0.4 | |
| 1973 | 61 | 22 | 14 (64) | 11 (50) | 39 | 53 (68) | 20 (26) | 1.6 ± 0.5 | |
| 1974 | 68 | 18 | 12 (67) | 9 (50) | 50 | 86 (86) | 42 (42) | 1.7 ± 0.4 | |
| 1975 | 87 | 14 | 10 (71) | 9 (64) | 73 | 112 (77) | 44 (29) | 1.8 ± 0.4 | |
| 1976 | 67 | 10 | 6 (60) | 4 (40) | 57 | 100 (88) | 45 (39) | 1.9 ± 0.4 | |
| Total | 425 | 94 | 58 (62) | 45 (48) | 331 | 519 (78) | 226 (34) | 1.8 ± 0.4 | |
| Manmanning | 1969 | 4 | 0 | 4 | 5 (63) | 2 (25) | 2 ± 0 | ||
| 1970 | 15 | 5 | 2 (40) | 0 | 10 | 16 (80) | 6 (30) | 1.7 ± 0.5 | |
| 1971 | 21 | 4 | 1 (25) | 0 | 17 | 25 (74) | 9 (26) | 1.8 ± 0.4 | |
| 1972 | 14 | 6 | 3 (50) | 1 (17) | 8 | 13 (81) | 0 | 1.6 ± 0.5 | |
| 1973 | 16 | 7 | 3 (43) | 2 (29) | 9 | 12 (67) | 2 (11) | 1.6 ± 0.5 | |
| 1974 | 12 | 4 | 2 (50) | 1 (25) | 8 | 16 (100) | 5 (31) | 1.7 ± 0.5 | |
| 1975 | 12 | 4 | 2 (50) | 1 (25) | 8 | 12 (75) | 4 (25) | 1.7 ± 0.5 | |
| 1976 | 4 | 1 | 0 | 0 | 3 | 4 (67) | 2 (33) | 1.8 ± 0.4 | |
| Total | 98 | 31 | 13 (42) | 5 (16) | 67 | 103 (77) | 30 (22) | 1.7 ± 0.5 | |
| Tarwonga | 1969 | 8 | 2 | 1 (50) | 1 (50) | 6 | 7 (58) | 4 (33) | 1.8 ± 0.4 |
| 1970 | 15 | 3 | 1 (33) | 1 (33) | 12 | 19 (79) | 7 (29) | 1.8 ± 0.4 | |
| Total | 23 | 5 | 2 (40) | 2 (40) | 18 | 26 (72) | 11 (31) | 1.8 ± 0.4 | |
| Moornaming | 1970 | 17 | 8 | 4 (50) | 2 (25) | 9 | 15 (83) | 8 (44) | 1.5 ± 0.5 |
| Nereeno Hill | 1975 | 8 | 4 | 1 (25) | 1 (25) | 4 | 6 (75) | 0 | 1.5 ± 0.5 |
| ‘Midlands’ | 1996 | 21 | 7 | 6 (86) | 4 (57) | 14 | 14 (50) | 8 (29) | 1.8 ± 0.4 |
| 1997 | 9 | 5 | 5 (100) | 4 (80) | 4 | 4 (50) | 4 (50) | 1.4 ± 0.5 | |
| 1998 | 9 | 4 | 4 (100) | 3 (75) | 5 | 6 (60) | 4 (40) | 1.5 ± 0.5 | |
| Total | 39 | 16 | 15 (94) | 11 (69) | 23 | 24 (52) | 16 (34) | 1.6 ± 0.2 |