Dolphins living of

Dolphins living off the coast of Wales whistle, bark and groan in a different dialect from dolphins off the western coast of Ireland, scientists have discovered.

Different physical environments might have contributed to the mammals developing distinctive sets of vocalizations or "dialects", said Simon Berrow from the Shannon Dolphin and Wildlife Foundation.

Berrow supervised a master's thesis by student Ronan Hickey at University of Wales, Bangor, who analyzed 1,882 whistles from the dolphins in the Shannon estuary and bottlenose dolphins in Cardigan Bay in Wales. The study found 32 different sound categories, of which eight were only produced by the Shannon animals.

"The idea that the sounds are different is not a bad notion -- you'd expect the information had to be different given the diversity of the areas where they reside," Berrow told Reuters, adding he would use the data to create a dictionary of sounds and pursue the research further, should time and money allow.