stag beetle
US /ˈstæɡ ˌbiːtl/
UK /ˈstæɡ ˌbiːtl/

1.
a large beetle, the male of which has large, branched mandibles resembling the antlers of a stag
:
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We saw a magnificent male stag beetle in the forest.
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The children were fascinated by the large stag beetle they found.