Killer whales use vocal learning to adopt vocalization patterns of neighboring species.

Introduction

Animals communicate with one another to warn against predators, find mates, and travel in groups. Most animals are born with basic linguistic abilities, but some animals can learn new ways to communicate as they grow. Understanding how animals learn and adapt their behavior can tell us a lot about the expanded roles communication can play in their lives.

Killer whales (Orcinus orca) are very intelligent, highly social marine mammals that use clicks, pulses, and whistles to communicate with each other. These sounds vary slightly between pods and result in different ways of “speaking” called dialects. Similar to how English spoken in Boston might sound different from English spoken in Dallas, killer whale dialects function similarly, but each has its own flavor.

The Strategy

Humans are now understanding more about how killer whales learn their vocal repertoire—and why. A study of killer whales held in captivity alongside bottlenose dolphins found that the killer whales changed their vocal patterns to more closely the dolphins’ sounds. They used a higher proportion of clicks and whistles, similar to the dolphins, and fewer pulses. One killer whale even adopted a sound that was taught to a dolphin by humans, indicating they can learn and use sounds not found in the natural environment.

This ability to learn new communication sounds is called “vocal learning,” and it suggests killer whales can receive new information and adapt their linguistic behavior to best fit their environment. Effective communication is critical to building relationships, which is necessary in animals like killer whales who rely on social groups to hunt and move through the ecosystem.

Vocal learning illustrates that communication is not stagnant, but rather evolves based on environmental and social conditions. As killer whales in the wild face disruptive threats through ship traffic, oil drilling, marine debris, and climate change, the ability to change communication strategies to best fit a new social group could be a very important skill.

Two killer whales swim at the ocean surface.
Image: Alexandre Roux / CC BY NC ND ‑ Creative Commons Attribution + Noncommercial + NoDerivatives

Killer whales travel in social groups called pods. 

One killer whale swims and one breaches in front of mountains.
Image: Christopher Michel / CC BY ‑ Creative Commons Attribution alone

Although scientists aren’t sure why killer whales breach, it could be a form of communication.

The Potential

Since humans are also a highly social species, lessons from killer whales could be applied to our own approaches towards communication and learning. Their willingness and ability to adapt shows that when in a new social context, it may be valuable first to listen to how the group is already sharing information, then incorporate that style into your own communications.

It is also a model for thinking outside the box in terms of community and communication. While it is unclear what effect the adopted sounds have on the dolphins or their relationship with the killer whales, there are several possibilities: they could allow for the communication of detailed information, improve group cohesion, or they could go unnoticed by the dolphins. Doctor Doolittle jokes aside, what improvements in the safety of humans, livestock, and wildlife could be made if humans could better learn to adopt other species’ forms of communication?

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Last Updated October 16, 2020