Mingulay and Berneray together hold the largest colony of Razorbills in the British Isles, around 15% of the Euopean population..

The western face of Berneray is the largest assemblage on a single cliff face recorded anywhere. Whereas in other colonies they normally occur scattered amongst other species, here they form the dominant bird present.

The count shown in the table was taken by SNH in 2003 and shows an increase around 40% over the previous figures taken in 1998.

Common Guillemots are spread generally across the western cliffs while the Black-legged Kittiwakes assemble in colonies on the most vertical, or even overhanging, sections.

Puffins nest along the tops of the cliffs all around the island but there is also a large colony on the northern slopes of the bay above the village on Mingulay..