Stag beetles are a group of about 1,200 species of beetle

Beetle

Coleoptera is an order of insects commonly called beetles. The word "coleoptera" is from the Greek , koleos, "sheath"; and , pteron, "wing", thus "sheathed wing". Coleoptera contains more species than any other order, constituting almost 25% of all known life-forms...

 in the family Lucanidae, presently classified in four subfamilies Some species grow up to over 12 cm (4.8 in), but most are about 5 cm (2 in).
The English

English language

English is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread into what was to become south-east Scotland under the influence of the Anglian medieval kingdom of Northumbria...

 name is derived from the large and distinctive mandibles

Insect mouthparts

Insects exhibit a range of mouthparts, adapted to particular modes of feeding. The earliest insects had chewing mouthparts...

 found on the males of most species, which resemble the antlers of stag

STAG

STAG: A Test of Love is a reality TV show hosted by Tommy Habeeb. Each episode profiles an engaged couple a week or two before their wedding. The cameras then follow the groom on his bachelor party...

s.

A well-known species in much of Europe

Europe

Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

 is Lucanus cervus

Lucanus cervus

Lucanus cervus is the best-known species of stag beetle , and is sometimes referred to simply as the stag beetle. It lives in holes in old trees and dead trunks, in the forest as well as in groves. Forest management, in eliminating old trees and deadwood, eliminates at the same time the habitat and...

, referred to in the United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 as "the" stag beetle (it is the largest terrestrial insect in the UK).