Do Dolphins Call One Another by Name?

Bottlenose dolphins develop distinctive calls that function remarkably like names, although scientists use the more cautious term “signature whistles.”

A young dolphin creates its signature whistle during its first months of life. Rather than inheriting one fixed call from its species, it learns and modifies a particular pattern. The whistle can remain recognizable for years, allowing other dolphins to identify the individual producing it even when visibility underwater is poor.

Researchers tested whether dolphins recognized the pattern itself or merely qualities of the caller’s voice. They created synthetic whistles that preserved the identifying pattern while removing the natural sound of the original voice. Dolphins still responded differently to familiar individuals, demonstrating that identity was carried by the whistle’s shape.

Other experiments found something even more suggestive. Dolphins sometimes copy the signature whistle of another individual, especially a close companion. When scientists played a dolphin’s own signature whistle through an underwater speaker, that dolphin frequently answered. This indicates that a copied whistle can be used to address a particular animal, much as calling a name attracts one person’s attention.

Scientists do not claim that dolphins possess human language. A signature whistle may communicate identity and location without carrying all the meanings a human name can acquire. Nevertheless, it is a learned, individually specific vocal label.

In an environment where animals may be separated by dark or murky water, dolphins have evolved a way to announce not merely that someone is calling, but who that someone is.