Humpback Whale Baby Whispers

Humpback whales are known for their beautiful love songs that travel kilometres through the oceans. However they showcase a different kind of vocalisation too. I recently read a study about how baby humpback whales and mums whisper to each other. The babies share intimate grunts and little squeaks that can only be heard by their mums. 

"And they're very quiet, like the baby humpback is whispering so it won't get overheard by somebody dangerous." - Nell Greenfieldboyce, NPR