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Talkback: Stag beetles
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I LOVE LOVE LOVE stag beetles! Do they come in two sizes? I sometimes see small ones -- are they the younger generation?
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I think you may be labouring under a misapprehension. Just as young butterflies are caterpillars, young stag beetles are grubs (or maggots or larvae depending on our vernacular choice). They do vary in size tremendously. The antlered 'stag' males are usually much bigger than the females. Then there is the lesser stag beetle, a different species, Dorcus parallelipipedus. Have a look at an earlier blog http://blog.gardenersworld.com/2008/06/25/rj-stag-beetle-25062008/ where there is a picture of female stag and lesser.
What luck to have 10 to 15 stag beetles in the garden each year. What a shame they are unwelcome. They are completely harmless unless you deliberately (and rather stupidly) thrust your finger into the male's jaws. In which case it will bite. In the spirit of scientific investigation I did just this a few years ago and ended up with blood all over my field note book. They are probably breeding in subterranean root systems and old stumps long since forgotten, buried in the soil and with no sign on the surface. The adults only live a few days or weeks. During this time they must find mates and the females must find a suitable place to lay eggs. They fall victim to birds, foxes, dogs, cats, cars and, sadly, pedestrians, treading them underfoot because they do not appreciate what gentle giant beasts they are.
Sounds like it might be a rose chafer, Cetonia aurata. Try this link to confirm your identification.