Khazar-khum Wrote:
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> Arcs with a central groove = birds, especially
> since they're on the ceiling. They look like
> birds, especially the way they've been placed.

It makes no difference where the engravings are found .
You find the same engravings on the top of capstones ,on the underside , on the outer supporting and on the inside of the supporting stones

No ,arcs with central grooves are just that .
They don't look like birds .

Ever seen the representation of birds on a dolmen before ? = no
Ever seen arcs with no grooves on a dolmen ?=yes
Ever seen grooves with no arcs on dolmen ?=yes
Ever seen arcs and grooves, together on a dolmen ?=yes .