Southern wood ant, Heeswijk-Dinther, Netherlands

This is one of 2 species that in dutch are referred to as the "Red Forest Ant". They look quite similar and can even form hybrids. This likely is Formica rufa, based on the habitat it is found in. This ant is superficially well known in the general public as almost everybody has once made the mistake of sitting in the wrong place, disturbing them. They have a mean bite and also spray acid.

They have a super interesting life cycle that I won't repeat here (click the species record) yet one particular fact I find most astonishing. Just like people, they have wars. When hostile nests meet, they're at war. Such a war can last for over a month and have thousands of casualties.

This is probably a female worker. Males have only a tiny reproductive role in society, and then die.