D. & J. W. LAWSON – Bibliographie

Harbour Seal vigilance : Watching for predators ? Abstract, Sixth Biennial Conference on the Biology of Marine Mammals, Vancouver, British Columbia.

Titre : Harbour Seal vigilance : Watching for predators ? Abstract, Sixth Biennial Conference on the Biology of Marine Mammals,

Titre : Play in Harbour Seals. J. Zool. Lond. vol. 208, pp. 73-82. , Date de publication : 1986 Auteur(s)

Titre : Quantitative aspects of harbour seal (Phoca vitulina) play. In Journal of Zoology (London), 212:267-273. , Date de publication

Titre : Harbour seal vigilance: watching for predators or mates? In Biology of Behaviour, 11:44-49. , Date de publication :