Mew Gull Larus canus canus; heinei; kamtschatschensis; brachyrhynchus
(last update: March 12, 2012)
Table 6: pattern on the alula.
From: Is it possible to age subadult Mew Gulls Larus canus?
by: Kenneth Bengtsson & Lennarth Blomquist, publication in: Anser 2-42(2003): p 73-92.
| Age: | N: | Blackish alula |
| 2 | 39 | 39 |
| 3 | 18 | 5 |
| 4 | 13 | 3 |
| 5 | 11 | 1 |
| 6 | 10 | 0 |
7 |
6 | 0 |
| 8-12 | 15 | 0 |
| 3-12 | 73 | 12% |
| adult reference group | 100 | 5% |