At Groin in Co. Kerry, a fulacht fia, the type of low, horseshoe-shaped mound associated with Bronze Age cooking or industrial activity and typically formed from fire-cracked stone and charcoal, was recorded on an Ordnance Survey map as recently as 1939, named along with neighbouring mounds as 'Fulachta Fian'. By the time anyone went to look at it properly, it had gone.

When the site was inspected in 1999, the surrounding land was in the process of being developed as a holiday-home complex, and no visible remains of the mound could be found. Archaeological monitoring during the ground disturbance work that followed failed to uncover any trace of it either. What makes this particular loss more telling is the density of what once surrounded it. Within roughly 200 metres to the north-west, at least three other fulachtaí fia and a separate burnt spread have been recorded, suggesting that this corner of Kerry was, at some point in prehistory, a site of repeated or sustained activity. The 1939 map alone recorded three mounds in the cluster. Whether the Groin example was destroyed during development, or had already been reduced to nothing long before anyone thought to look, is not clear.