Fig. 6
From: Three Dimensional Tracking of Exploratory Behavior of Barnacle Cyprids Using Stereoscopy
Two trajectories ofSemibalanus balanoides cyprids, exploring a glass surface in xy representation (a) and xz representation (b). In the red circled regions of subplot (a) it seems like a close inspection of the surface is taking place at low speeds, but if the third dimension is considered (b) it becomes obvious that these regions represent gravity induced passive sinking phases