The rippling locomotion of Ribbon Eels, a Stomphia coccinea sea anemone swimming, and Swimming Feather Starfish.
Alexandra Khrizman and colleagues at the Hebrew University of Jerusalem and Tel Aviv University made more than 100 dives and planted cameras among garden eels to determine how they handle currents, and whether being stationary interferes with getting a good meal.
The remote cameras were necessary because, Ms. Khrizman said, “The eels are very shy…”
In calm water the eels take any shape that works, striking in any direction at the tiny animals in the water… The shape makes the drag four times less than it would be if they didn’t reshape their bodies. And they can still feed effectively, unlike free-swimming fish, because they aren’t fighting the current.