Fig. 2 | Scientific Reports

Fig. 2

From: Effects of experience and familiarity on visual attention and behaviours of bottlenose dolphins (Tursiops truncatus) in presence of humans

Fig. 2

Effects of familiarity on Visual attention and laterality: (a) Bar plot (Mean ± S.D.) showing the duration of dolphins’ presence in the area around the human during the tests according to whether the human is familiar (black) or unfamiliar (grey) (Wilcoxon test: *p < 0.05). (b) Scatter plot (Mean ± S.D.) showing the negative correlation between the strength of laterality (Laterality Index) and the proportion of pass swimming including glances/pass swimming without glancing towards Familiar humans (black) and the absence of correlation for Unfamiliar humans (grey): the more the dolphins monitor visually the familiar human, the less they are lateralized (Spearman correlation test *, p = 0.05). It is worth noting though that individual variations were high, even for the familiar human.

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