Shorebirds of Ireland, Freshwater Birds of Ireland and The Birds of Ireland: A Field Guide 2nd Edition with Jim Wilson.
www.markcarmodyphotography.com
The Black Guillemot or Tystie (Cepphus grylle) is a medium-sized alcid.
Adult birds have black bodies with a white wing patch, a thin dark bill, and red legs and feet. They show white wing linings in flight. In winter, the upperparts are pale grey and the underparts are white. The wings remain black with the large white patch on the inner wing.
Their breeding habitat is rocky shores, cliffs and islands on northern Atlantic coasts in eastern North America as far south as Maine, and in western Europe as far south as Ireland.They are one of the few birds to breed on Surtsey, Iceland a new volcanic island. In the UK it is a fairly common breeding bird in western and northern Scotland and Ireland. In the rest of Great Britain they only breed at St. Bees Head in Cumbria, the Isle of Man and on east Anglesey in north Wales. Some birds breed in Alaska where their range overlaps with the similar Pigeon Guillemot.
These birds often overwinter in their breeding areas, moving to open waters if necessary, but usually not migrating very far south.
They dive for food from the surface, swimming underwater. They mainly eat fish and crustaceans, also some mollusks, insects and plant material. (wikipedia)
This was an adult winter bird at the mouth of Dun Laoghaire harbour earlier in the Spring of 2025.
