"To the jubilation of a packed crowd of black-clad Bat fans last night, Ballycastle beat League leaders, the Tornados...."
-- match report in the Daily Prophet (DP2)
They are considered to be Northern Ireland's most celebrated team.
Fans of the team usually wear black (DP2).
Ballycastle, in County Antrim, Northern Ireland, has hurling and Gaelic football teams listed in its Wikipedia entry, but no Quidditch teams (Wikipedia).
From the Web
Pottermore feature: British and Irish Quidditch teams to support