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Stag beetles are usually large and dark in color (the one in the photo was approximately 3.5 cm in length). The males have large branched jaws that resemble a stag's antlers, hence the name stag beetle. They are in the family Lucanidae, of which there are currently about 1,200 identified species. Some stags can grow up to 12+ cm (4.7 in), but typically they are about 5 cm (2.0 in).
Subtropical mountainous area, dense brush and trees, hot and humid, running stream.