Tracking Snail Movements with LEDs

(Video Link)

Although it may look like an art project, these researchers from the University of Exeter are actually trying to track the movements of snails that carry lungworm parasites--a deadly menace to dogs in the UK. So they placed LEDs and UV paint on the snails. Skip to 2:49 in the video to see the snails in action.

-via Colossal

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There is too much intervention during the experiment. Snails are sensitive to light, and so having people use flashlights on them during the night would change their behavior. Also, I don't know if snails are blind to ultraviolet light. If they are not, then their behavior will be quite atypical during the experiment. It is well known that the location of a snail or its velocity may be determined, but not both.
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