Vorticella

Capturing Vorticella campanula requires a departure from traditional trail cameras; instead, you will need a digital microscope or a high-magnification macro lens attachment for your smartphone. To find them, collect a sample of submerged aquatic vegetation, such as pondweed or moss, from a clean, non-stagnant freshwater source. Because Vorticella campanula specifically avoids contaminated water, look for clear ponds with healthy plant life rather than stagnant, murky puddles.

Place your plant sample in a shallow petri dish or a well-slide with enough pond water to keep it submerged. When setting up your camera, lighting is your most important tool. Because Vorticella are translucent, standard brightfield lighting (light from directly below) can make them look washed out. Try using "oblique illumination" by tilting your light source or using a darkfield filter; this will make the delicate bell and the coiling stalk glow against a dark background, revealing incredible structural detail.

To capture the best video footage, use a high-speed or slow-motion setting (at least 120 frames per second). This is the only way to clearly see the mechanics of the stalk coiling, as the movement is too fast for standard video to record without blurring. Set your focus on the "zooid" (the bell part) and wait. If you want to trigger the contraction for the camera, a very gentle tap on the microscope stage or the edge of the slide will usually provide enough vibration to send the Vorticella into its signature spiral.