European stag beetle

About

The European stag beetle, or deer beetle, is the largest beetle in Europe. It inhabits old deciduous forests, primarily oak forests, parks, and gardens with old trees. In the Carpathians, the stag beetle is most often found in oak forests and beech forests of the foothills and low mountains of Zakarpattia and Prykarpattia, as well as in Poland, Slovakia, and Romania.

Males are unmistakable: their upper jaws have grown into huge antler-like 'horns' resembling those of a deer, and together with them, the beetle can reach a length of up to 7–8 cm. The body is black, and the elytra are chestnut-brown. Females are noticeably smaller, with short but strong jaws.

Adult beetles live only a few weeks, from late May to July. They fly on warm evenings, buzzing, holding their bodies almost vertically, and are attracted to the sap that oozes from wounded oaks. The 'horns' are needed by males for battles over females: rivals try to lift and throw each other off branches.

Most of the stag beetle's life is spent as a larva: for several years—usually four to six—it grows in the decaying wood of old stumps and roots of oaks and other deciduous trees. Therefore, it is crucial for the European stag beetle to leave old trees, stumps, and dead wood in the forest.

The European stag beetle is listed in the Red Book of Ukraine as a rare species, and in the EU, it is included in Annex II of the Habitats Directive. Catching and collecting beetles is prohibited.

Where in the Carpathians

The map shows where naturalists recorded the species (GBIF, CC0 and CC BY records), not every place it lives. The Ukrainian Carpathians are less studied, so a blank area does not mean the species is absent.

Countries

Hungary · Ukraine · Slovakia · Romania · Czechia · Austria · Serbia

Mountain ranges

Mátra, Börzsöny and Cserhát, Bükk, Vihorlat-Gutin Volcanic Ridge, Zemplén Mountains, Maramureș Mountains, Polonynian Ridge, Strážov Mountains, Krasna Polonyna, Gorgany

Altitude belts

Foothills (below 600 m)

When to see it

From naturalists’ observations in the Carpathians (iNaturalist, research grade): the darker the cell, the more often the species is seen that month.

Protection and rules

Catching and collecting is prohibited: the species is listed in the Red Book of Ukraine.

Admire, don’t pick: plants listed in the Red Data Book of Ukraine — and any plants in nature reserves and strictly protected zones of national parks — must not be collected.

Red Data Book of Ukraine

FAQ