The highlight of my day today was going for a walk through our local forest park (fureai-no-mori). I found several of these large (8mm) black and red carpenter ants feeding on the nectar of wild strawberry flowers.
More information at JAnt: here
Carpenter Ant = Nishi-muneaka-oo-ari
Location: Fureai-no-mori near Munakata Common (map).