DR OLIVER SKIBBE / SCIENCE PHOTO LIBRARY DR OLIVER SKIBBE / SCIENCE PHOTO LIBRARY
Lacrymaria protozoan. Light microscopy footage of the ciliate protozoan Lacrymaria olor (the 'swan') extending its long neck while hunting for a Cyclidium protozoan. Lacrymaria cannot see its prey, but toxicysts are fired when chemoreceptors detect that a target has been hit. Lacrymaria olor measures about 60 micrometres across when contracted, but can reach a length of 700 micrometres when extended. It is found in ponds, lakes and streams throughout much of the world. Here, its Cyclidium prey (at bottom in the second half of the clip) senses water movement with its cilia and escapes. Filmed in a sample of pond water from Berlin, Germany. See K005/2249 for cropped version.
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