| Nocturnal scavenging by gulls in the Southern North Sea |  |
| Garthe, S.; Hüppop, O. (1996). Nocturnal scavenging by gulls in the Southern North Sea Colon. Waterbirds 19(2): 232-241 |
| In: Colonial Waterbirds. Colonial Waterbird Society: De Leon Springs. ISSN 0738-6028, meer |
|
