Files in this Data Supplement:

• Figure 3 Movie -

  Figure 3. Movie Tritonia diomedea crawls upstream towards conspecifics in a flow tank. Flow (arrow) is shown by fluorescein dye added across the tank at ‘d’. Three T. diomedea added to the flow-through odour stimulus chambers (osc) provide an upstream odour source for the tested T. diomedea which is introduced downstream, inside a starting box (s). Once the starting box gate (g) is removed, the tested slug remains stationary, and then subsequently crawls directly upstream (arrowhead) towards the odour stimulus chamber with 2 conspecifics (*). Time-lapse speed shown bottom left. Tank dimensions shown: 1.5m ´ 1.0m.

• Figure 5A Movie
• Figure 5B Movie
• Figure 5C Movie
• Figure 5D Movie -

  Figure 5. Movie Examples of crawling relative to prey and predator odours for Tritonia diomedea that highlight the differences in orientation with and without rhinophores. Each movie is a motion enhanced video, showing slug movement in the flow tank (initial direction shown by arrowhead) and a dyed odour plume (‘o’ marks the eventual location of the odour plume source). After flow (without odour) was established in the tank (left to right), slugs (s) were placed on one side of the flow tank, and crawled approximately cross stream, before encountering the odour plume created with outflow (arrow) from a header tank containing either prey or predators. With rhinophores, slugs responded with upstream crawling towards prey odour (A) or a downstream turn away from predator odour (B). Without rhinophores, slugs showed no response to the odour plume (C and D). Time-lapse speed shown top left. Tank dimensions shown: 1.5m ´ 1.0m.