Stag beetle: The forest 'indicator' with antler-like jaws

Stag beetles are an unusual group: many males carry a pair of huge, curved "jaws" on their heads, looking rather like antlers. Those jaws are not for biting people — they are wrestling weapons males use to contest territory and tree sap. Stag beetles also have a deep connection with forests. Let's meet this "forest mascot".

Its body

A stag beetle's jaws are striking, and the larger individuals often show them off the most. When they fight, males press these jaws against each other, and whoever flips the other wins the precious sap or territory. The female's jaws are far smaller; her job is to lay eggs in rotten wood.

Stag beetles have sturdy bodies in shades from glossy black to reddish-brown. They look imposing but are harmless to people and feed mainly on sap.

Where it lives and why it matters

Their larvae eat decaying wood and live inside dead trunks for several years before pupating and emerging as beetles. Because their whole lives depend on old trees and dead wood, stag beetles serve as an "indicator species" of forest health: where they thrive, the forest still holds enough old and dead wood. In other words, protecting the old trees is protecting the stag beetle's home.

A note for grown-ups

You could talk with a child about how scary-looking jaws are not for biting people: the most intimidating weapon usually has its own real purpose. Inviting a child to wonder "what exactly is it fighting for?" is far more rewarding than simply being frightened of it.