Movie S5.

A young adult performing an omega turn in a fluid stream (460 µL/h, 2,130 µm/s) in a conduit whose width (0.6 mm) is smaller than the length of the animal (∼1 mm). The flow is to the left. Play speed: 0.5× real time. (Scale bar: 1 mm.)

Propensity of undulatory swimmers, such as worms, to go against the flow

Jinzhou Yuan, David M. Raizen, and Haim H. Bau

PNAS. 2015. DOI: 10.1073/pnas.1424962112