Mae Ynys Dewi ac Ynys Gwales yn gartref i rai o nythfeydd huganod pwysicaf y byd, gyda gwylogod, adar drycin Manaw, llursod a hebogiaid tramor hefyd yn nythu ar eu glannau.
Ramsey and Grassholm are home to some of the world’s most important gannet colonies, with guillemots, Manx sheerwater, razorbills and peregrine falcons also nesting on their shores.