The black-necked grebe is a rare winter visitor to coastal areas from October to March. It used to breed here on well vegetated lakes in western Ireland. The make has distinctive ochre-coloured breeding plumage with the rest of the upper parts coloured black or dark brown. The non-breeding plumage is greyish-black. The black-necked grebe feeds mostly on insects, caught on the surface of water or in flight. It also eats foliage, crustaceans, molluscs, tadpoles, small frogs and fish. It makes a floating cup nest on an open lake which is covered with a disc.
The black-necked grebe travels as much as 6,000 kilometers during migration. After migration the bird moults, at which point it is unable to fly for about two months.
It is red-listed in Ireland due to sever decline in the breeding population.