Scientists Thought These 53 Species

As a toddler might eagerly tell you, owls hoot, dogs bark and cows moo. But when it comes to turtles, for example, even scientists would have struggled to say what sound they make. Until now, researchers had assumed a whole slew of species were silent.

But new research, published last week in Nature Communications, suggests that at least 53 of those creatures previously thought to be soundless are actually communicating with vocalizations.