whistles

narrow-band, tonal sounds produced by many toothed whales for communication purposes. Whistles are frequency-modulated, which means the pitch of the sound changes over time.

Glossary: signature whistle
Hot Topic- Killer Whales and Vessel Noise
Underwater Acoustic Impacts of COVID-19
What are common underwater sounds?
Individual-specific Vocalizations
How do marine mammals produce sounds?
Amazon River Dolphin, Boto
Small Vessels
Group-specific Vocalizations
Baiji, Yangtze River Dolphin