Non-metrical skull variation in two Scottish colonies of the Grey seal



Twenty non-metrical variants are described in the skulls of Grey seals (Halichoerus grypus). Ten of these have been classified in samples of 47 skulls from Orkney and 18 from the Hebrides. The frequencies of one variant were “significantly” different (P≏1%) in the two samples. This result means that there is some genetical distinctiveness between the two samples and suggests a way of characterizing and hence comparing seal groups.