(Color online) Location of EARs around the islands of Kauai and Ni'ihau. The depth of each EAR is shown next to the symbol marking it location.
(Color online) A beaked whale (a) time waveform and (b) time-frequency properties of the signal computed as a Wigner-Ville distribution.
An example of the percentage of the maximum number of files per day that contain biosonar signals for each species in the period from 20 October 2010 until 26 January 2011 at the SW location of Kauai.
(Color online) An example of the average number of files in which foraging clicks from the different species were detected on an hourly basis for the time period between 20 October 2010 and 26 January 2011 at the SW location of Kauai. The percentage of twilight-night detection is shown in the shaded block of each histogram.
Biosonar beam pattern of an Atlantic bottlenose dolphin (from Au et al., 2012 ).
The percentage of files with biosonar clicks detected during the twilight-night time period from the different species and different locations around Kauai and one location off Ni'ihau.
The overall percentage of twilight-night time detection for all the locations and time period.
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