Many expectant parents will chat away to their babies in the womb.
But it appears that humans are not the only species who like to communicate with their young before they are born.
New research has shown that dolphin mothers sing to their unborn calves by singing their name.
The mothers teach their babies their ‘signature whistle’ before birth and in the two weeks after, which the animals use to identify one another.
Signature whistles are sounds made by dolphins, used to identify different individuals.
Dolphin calves will eventually make their own individual whistle, but in the first stages of life, they use their mother’s.
The researchers studied a dolphin mother at Six Flags Discovery Kingdom in California, who gave birth to a dolphin baby called Mira in 2014.
They recorded 80 hours of sounds from the mother, baby, and other dolphins in the enclosure, during the two months before birth, and two months after birth.
The recordings showed that the mother dolphin began increasing her signature whistle two weeks before birth, and continued to do so for two weeks after birth, before tapering off.
In contrast, the other dolphins in the enclosure did not produce their own signature whistle at very high rates during this time.
Researchers from the University of Southern Mississippi, have suggested that the mothers teach their babies the whistle as part of the imprinting process.
Signature whistles are sounds made by dolphins, used to identify different individuals.
Dolphin calves will eventually make their own individual whistle, but in the first stages of life, they use their mother’s.
Previous studies have shown that mother dolphins whistle their signature tune more in the days before birth.
However, this is the first study to look at how a mother dolphin whistles in the presence of other dolphins, before and after birth.
The researchers studied a dolphin mother at Six Flags Discovery Kingdom in California, who gave birth to a dolphin baby called Mira in 2014.
They recorded 80 hours of sounds from the mother, baby, and other dolphins in the enclosure, during the two months before birth, and two months after birth.
The recordings showed that the mother dolphin began increasing her signature whistle two weeks before birth, and continued to do so for two weeks after birth, before tapering off.
In contrast, the other dolphins in the enclosure did not produce their own signature whistle at very high rates during this time.
Speaking to Live Science, Dr Audra Ames, lead researcher said: ‘What the other dolphins might be doing here is remaining quiet so the calf does not imprint on the wrong signature whistle.’
Once the mother began tapering off the signature sound, the other dolphins then resumed their usual noises.
Baby dolphins begin to develop their own signature sound at around two months old.
They usually develop a whistle very different to those around them, to avoid confusion.
Dr Ames added: 'We actually do see that human babies develop a preference for their mother's voice in the last trimester.
Dolphins that live in pods in certain areas off the coast of the UK have been spotted communicating with unique sounds - regional accents - off the coat of Wales.
And now a group of marine biologists is studying dolphins in the water around Jersey to determine if these 'accents' are widespread.
Researchers from the Marine Biology Section of Societe Jersiaise in the Channel Islands will compare the noises made by dolphins off the Channel Islands with those from elsewhere.
To do this, hydrophones - microphones designed to be used underwater - will be placed in the waters around Jersey, which is home to the UK's largest resident dolphin population.
They will be fitted with SD cards to record noises, which scientists say will help them identify 'numbers, species and movements' of the mammals.
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