Fig. 2
From: Animal-borne acoustic data alone can provide high accuracy classification of activity budgets

Density estimation of a selection of acoustic features for each activity (8 out of 21 temporal features, 8 out of 14 spectral features). Means and medians are represented by blue and black lines, respectively. The red crosses indicate the values for each feature calculated on the data sample illustrated on Fig. 1 (calculated as means on all segments per class)