London, October 30 : A team of Canadian and British researchers has found that sperm whales sing duets to cement the bonds between individuals within a social group.
Researchers from Dalhousie University in Halifax, Nova Scotia, Canada, and the University of St Andrews in the UK followed a group of nine sperm whales in the Pacific Ocean near the Galapagos Islands, and seven in the Caribbean.
The team used a series of underwater hydrophones to record the whales'' characteristic clicking sounds.
They said that on 15 of the 19 occasions, when the position of each whale could be identified, the animals were close enough to see one another, suggesting that the song was not being used to locate another whale.