| Titre : | Dansk Ornitologisk Forenings Tidsskrift 108(4) - 2014 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
During the Christmas and New Year holidays 2010/11, the Danish Ornithological Society organized a census to improve our knowledge on the numbers and use of communal night-time roosts of wintering Common and Black-headed Gulls in Denmark. As earl[...]
Article
Compass orientation in reference to the magnetic field is a well established behaviour in birds and other animals. On the other hand, the presence and significance of magnetic gradient navigation is more controversial though the time-trend is to[...]
