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He had seen water striders, those insects that support themselves in swift streams on long legs kept wide apart.

Trygstad, an avid fly fisherman, has long observed water striders and would like to further study their movements.

Biologists and physicists have long studied water-walking insects, and already, scooting water striders have helped engineers build robots that can leap from the water’s surface.

There were migrating birds in the trees, water striders in the stream and all sorts of invertebrates in the fallen leaves.

It also appears to allow them to evade predators waiting in the water below, as the caterpillar in the video above does, zipping past a swarm of hungry water striders.