Mumbai, Nov. 14 -- Indian grey wolves use four kinds of sounds to communicate different messages with each other, a first-of-its-kind study by wildlife researchers reveals.

The study - Characterising the harmonic vocal repertoire of the Indian wolf - published in the international peer-reviewed research journal Plos One on October 31, is based on the analysis of 270 recorded vocalisations from wild and captive Indian grey wolf populations.

Researchers found that the wolves used distinct sounds - howls, howl-barks, whimpers, social squeaks, and whines - each indicating different aspects of the animal's social behaviour.

Vocalisation plays a critical role in conveying information on foraging, reproduction, safety and other behaviours amo...