Antlion
THE RED ANTLION, UNDER THE GROUND. FANGS OF YOUTH, UNEARTHED WITH A PHOTO.
Pippins, Chapter 3
Antlions[1] (JP: アリジゴク) are NPCs who appear on the Island Board of The Legend of Tenna.
Antlions burrow themselves in the sand, moving around with only their pincers being visible above the surface. The colors of the pincers can be red, blue, or black.

There are five antlions in the cave on the north side of the main island: four blue antlions and one red antlion. The party is separated from the area in which the antlions are burrowing by a barrier, so cannot directly interact with them, but can photograph them with the camera. The red antlion is the target of one of the Grand Photos, while photographing the blue antlions awards 10 POINTs each (one time per antlion) and turns them black. If all antlions are photographed, they will swirl around in two circles while hearts appear.
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THE RED ANTLION, UNDER THE GROUND.
— Pippins, Chapter 3