By Amanda Stringfellow @amanda_l_s
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Each year, tens of thousands of Guillemots and Razorbills come to breed and nest at the coastal nature reserve RSBP Fowlsheugh, on the Aberdeenshire coast, Scotland.
The two species of black and white birds only come ashore once a year during the breeding season, spending the rest of their lives at sea.
Stunning pictures capture the large colonies as they huddle together on the massive 200ft sea-cliffs - where the birds congregate in the spring and early summer.
Razorbills with white streaks near their eyes and chunky bills sit in couples on the cliffs while the guillemots bunch together on the steep rock like bowling pins.
The photographs were captured by photographer Robert Lenfert, 42 from Stonehaven, Scotland on a visit to the reserve.
Robert said: "In the spring, the towering seaside cliffs of Fowlsheugh host tens of thousands of nesting seabirds such as fulmars, guillemots, kittiwakes, puffins and razorbills.
“Fowlsheugh is a coastal nature reserve, owned by the Royal Society for the Protection of Birds (RSPB) and is a site of Special Scientific Interest (SSSI) as designated by Scottish Natural Heritage.
“The reserve is located along the Aberdeenshire coast in Eastern Scotland, just south of Stonehaven and Dunnottar Castle.
“Fowlsheugh is particularly is noted for its dramatic cliffs which tower up to 230 feet above the waters of the North Sea."