Narrow Headed Ant Formica exsecta

The Narrow Headed Ant is a wood ant, which are the largest type of ant in Britain. The species is aggressive, sometimes attacking larger wood ants. Winged ants fly in July and August. Nests usually hold more than one queen and about a thousand workers. Workers take a sweet liquid known as “honeydew” from aphids and also scavenge other invertebrates. Nest mounds are typically 25cm high, 30cm in diameter and built in sunny locations to maximise warmth. The main threats to this species are road developments and intensive land management, such as that of management for game.


A red and dark brown wood ant with a single segment as a “waist.” Queens and reproductive males have well-developed thoraxes and are larger than the worker ants. Worker ants can be distinguished from other wood ants by a charateristic deep notch on the back of the ant’s head. Males have obvious sex organs protuding from the abdomen.


Length: 10 to 12mm.


Listed as Endangered on the Great Britain Red List and is a UKBAP priority species.


Found only in the Scottish Highlands and parts of southern England.

When to see

July – August


Reproductive females, known as queens, shed their wings after mating.

Common name

Narrow Headed Ant

Species name

Formica exsecta

When to see in Scotland

July – August

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