South Bull Light, River Boyne

 As one enters the mouth of the river, a series of beacons and daymarks, leads you westwards towards Drogheda. The red lights are on the south side of the river, the green lights on the north side of the river.

 The stone perches seem to be fairly old, as presumably they are the ones that the Inspection Committee were complaining about in 1864 (see previous Aleria post)

 As an ornithological expert, I suggest that the bird in the photo below is a heron-type thingy.