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Some species of baleen whales avoid attracting killer whales by singing too low to be heard
Baleen whales in the northwest Atlantic are p - EurekAlert
Into the blue: How baleen whales have adapted over the past 50 million years - EurekAlert
Baleen whales evolved a unique larynx to communicate but cannot escape human noise
No One Knows How the Biggest Animals on Earth--Baleen Whales--Find Their Food
