Researchers at the nonprofit Cetos Research Organization have shown for the first ever that humpback whale calves make sounds.

The organization studied the whales off the coasts of Maui and Kauai, and said the squealing noises made by the young whales are messages to their mothers.

However, the sounds are not as complex as the continuous, repetitive and highly structured sounds made by the older male whales.

Ann Zoidis, the project’s research director, said the sounds made by the whale calves could be either warnings of threats of danger, or may simply be expressions of curiosity.

According to the study, the calves produced a limited number of sounds that were short and simple in their structure and included repetitive grunts that increased in strength.

The sounds were sometimes accompanied by bubble streams and appeared to function as an alarm call to the mother.

They researchers said the sounds occurred more frequently when the mother was at rest, or during periods of slow travel.

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(Source: redOrbit)