Fig. 8
From: Seasonal and diel acoustic activity of sei whales (Balaenoptera borealis) in the New York Bight

Examples of (a) singlet, (b) doublet, and (c) triplet sei whale downsweeps.
From: Seasonal and diel acoustic activity of sei whales (Balaenoptera borealis) in the New York Bight

Examples of (a) singlet, (b) doublet, and (c) triplet sei whale downsweeps.