Dolphins 'shout' over loud underwater noise to complete a cooperative task
Dolphins, humans both benefit from fishing collaboration
Whales Go Quiet And Dolphins Shout In Loud Oceans, New Studies Show
What is echolocation and which animals use it? - Discover Wildlife
The Loudest Underwater Sound Ever Recorded
Dolphins Shout to Be Heard over Boat Noise - Scientific American
Noisy waters force dolphins to “shout” to each other - The Washington Post
Dolphins Are Screaming Because of Underwater Drilling Noise
New research shows dolphins shout to each other under the water - BBC Newsround
Nuisance Noise, Underwater and in the Air
Dolphins have to 'shout' to hear each other over noise pollution, research reveals
How many countries have river dolphins? - Quora
How are dolphins able to stay underwater for so long without breathing? - Quora