This group of eight terraced, Tertiary basalt islands (c.128 ha), together with three smaller vegetated islets and numerous skerries (56.497°N x 6.418°W), is situated at its closest 3 km west of Mull, N.W. Scotland.
Uninhabited by humans since 1834 and livestock since the 1980’s, the Isles are of importance for breeding seabirds (over 23,900 pairs), which includes Storm Petrels (10,228 pairs), large numbers of auks (predominately coomon g uillemot at 10,495 individuals), Manx Shearwaters (1,992 pairs) and other common breeding seabirds. To coincide with the most profitable period for seabird monitoring and optimum weather and day length, Treshnish Isles Auk Ringing Group generally visit the Treshnish Isles in the last week of June to undertake an annual seabird census and ringing of specific seabird colonies.
The Treshnish Isles became a SEATRACK location in 2019 with GLS loggers being deployed on Atlantic Puffins and common guillemots.
Seatrack partner
Robin Ward
Treshnish Isles Auk Ringing Group
Data availability
