Fig. 2: Fin stretching and tail lowering during yawning.
From: Diving back two hundred million years: yawn contagion in fish
The panel (A) is a descriptive illustration showing that a fin stretching and tail lowering event always falls within the yawning time window. In the panel (B) the boxplot depicts the duration of yawns with (red) or without (yellow) the stretching event. The dots represent raw data points. The boxes display the median and the first and third quartiles, with whiskers extending to the most extreme values within 1.5 times the interquartile range.
