A killer whale has been taught by scientists to copy human speech.

The researchers were studying a 14-year-old female killer whale named Wikie, who was well-trained and had been taught how to copy behaviours in a previous study.

Wikie was recorded mimicking English words like “hello”, “bye bye” and “one two”, as well as the name of her trainer, Amy.

“Killer whales use their blowhole to make noises, almost like speaking out of your nose, so we were not expecting it to be perfect,” said Dr Jose Abramson, a researcher at the Complutense University of Madrid, who led the study.

“But we were surprised by how close it was.”

SeaWorld's killer whales Show all 10 1 /10 SeaWorld's killer whales SeaWorld's killer whales Visitors are greeted by an Orca killer whale as they attend a show featuring the whales during a visit to the animal theme park SeaWorld in San Diego, California March 19, 2014. A California lawmaker introduced a bill to ban live performances and captive breeding of killer whales in the state, a measure that would force the SeaWorld San Diego marine theme park to end is popular "Shamu" shows. Mike Blake/Reuters SeaWorld's killer whales A trainer shows the crowd a killer whale during a show at the animal theme park SeaWorld in San Diego, California March 19, 2014. A California lawmaker introduced a bill to ban live performances and captive breeding of killer whales in the state, a measure that would force the SeaWorld San Diego marine theme park to end is popular "Shamu" shows. Mike Blake/Reuters SeaWorld's killer whales An Orca killer whale is seen underwater at the animal theme park SeaWorld in San Diego, California March 19, 2014. A California lawmaker introduced a bill to ban live performances and captive breeding of killer whales in the state, a measure that would force the SeaWorld San Diego marine theme park to end is popular "Shamu" shows. Mike Blake/Reuters SeaWorld's killer whales Visitors get a close-up view of an Orca killer whale during a visit to the animal theme park SeaWorld in San Diego, California March 19, 2014. A California lawmaker introduced a bill to ban live performances and captive breeding of killer whales in the state, a measure that would force the SeaWorld San Diego marine theme park to end is popular "Shamu" shows. Mike Blake/Reuters SeaWorld's killer whales Trainers have Orca killer whales perform for the crowd during a show at the animal theme park SeaWorld in San Diego, California March 19, 2014. A California lawmaker introduced a bill to ban live performances and captive breeding of killer whales in the state, a measure that would force the SeaWorld San Diego marine theme park to end is popular "Shamu" shows. Mike Blake/Reuters SeaWorld's killer whales Trainers have Orca killer whales perform for the crowd during a show at the animal theme park SeaWorld in San Diego, California March 19, 2014. A California lawmaker introduced a bill to ban live performances and captive breeding of killer whales in the state, a measure that would force the SeaWorld San Diego marine theme park to end is popular "Shamu" shows. Mike Blake/Reuters SeaWorld's killer whales Trainers have Orca killer whales perform for the crowd during a show at the animal theme park SeaWorld in San Diego, California March 19, 2014. A California lawmaker introduced a bill to ban live performances and captive breeding of killer whales in the state, a measure that would force the SeaWorld San Diego marine theme park to end is popular "Shamu" shows. Mike Blake/Reuters SeaWorld's killer whales Trainers have Orca killer whales perform for the crowd during a show at the animal theme park SeaWorld in San Diego, California March 19, 2014. A California lawmaker introduced a bill to ban live performances and captive breeding of killer whales in the state, a measure that would force the SeaWorld San Diego marine theme park to end is popular "Shamu" shows. Mike Blake/Reuters SeaWorld's killer whales Tillikum, a killer whale at SeaWorld amusement park, performs during the show "Believe" in Orlando, September 3, 2009. A killer whale at the SeaWorld amusement park in central Florida killed a trainer on February 24, 2010, police and company executives said. According to the Orlando Sentinel the orca involved in the incident, named Tillikum but popularly known as "Tilly," has a controversial past. Mathieu Belanger/Reuters SeaWorld's killer whales An unidentified trainer works with a killer whale during the "Believe" show at Sea World in Orlando, Florida, in this photograph taken on February 14, 2010. A killer whale at the SeaWorld amusement park in central Florida killed a trainer on February 24, 2010, police and company executives said. Picture taken February 14. Richard Baum/Reuters

The scientists wanted to understand how capable whales are of imitating noises, so they could understand how whales learn in their natural habitat.

In addition to human sounds, Wikie was exposed to noises made by another killer whale to see if she was capable of imitating them.

After listening to the human or whale sound, Wikie was requested to reproduce them by her trainer saying “do this”.

Wikie’s calf, a three-year-old whale named Moana, was taught to make five unique sounds that could then be used to test his mother.

Human sounds were thought to be suitably distant from the killer whale’s usual repertoire of noises that they would provide a more advanced test of her ability to imitate.

To determine whether the original sounds and Wikie’s versions matched, the researchers asked human judges to decide, and then ran computer algorithms to provide a more objective assessment of the similarities.

Imitating vocal sounds in this way is a key component of language, and the ability to do so is rare in mammals besides humans.

Despite their intelligence, other primates are not generally capable of such imitation.

However, cetaceans – the mammal group that includes whales and dolphins – are known to be highly adept when it comes to vocal imitation. Both bottlenose dolphins and beluga whales have been observed copying noises they are exposed to.

In the wild, different killer whale groups demonstrate unique vocal “dialects”, and they have been documented copying noises made by other species.

“They have even been known to imitate bottlenose dolphins and sea lions,” said Dr Abramson.

“We still don't fully understand why some animals learn to mimic, but there are a few possibilities," said Dr Alex Thornton, a senior lecturer in cognitive evolution at the University of Exeter who was not involved in the study.

Some animal imitate others to deceive them, while other animals appear to do so in order to show off to potential mates, according to Dr Thornton.

“In some cases copying sounds might help to identify an individual as a member of a group," he said, explaining the dialects of whales help to mark them out as members of specific groups.

The scientists thought the ability of Wilkie to imitate new noises may provide some insight into the process by which whales imitate the sounds they hear in the wild, and acquire dialects.

Though the study was confined to one individual, Dr Abramson said it was a good indicator of what these whales are capable of doing.

“We are looking at what these animals can do,” said Dr Abramson.