Tiger beetles (hanmyou) are very fast-moving predatory beetles with bulging eyes, long slender legs, and large mandibles (jaws). They can run so fast that they could be considered the fastest running animals in the world (for their size). A 20mm-long beetle running at 2km per hour is the equivalent of a 2m-long horse running at 200km per hour!! (And some Tiger Beetles are said to run at 5km per hour!)
The larvae (grubs) of these beetles live in holes in the ground and they lie in wait for their prey to walk by/over the hole, then quickly grab them with their mandibles.
Cicindela japana (niwahanmyou)