New York, June 22 : Koko the gorilla, who appeared on National Geographic magazine cover, could chat, tease and even argue with scientists using more than 1,000 hand signs, has died in California at the age of 46.

Koko -- the primary ambassador for her endangered species, who redrew the lines of animal-human communication -- passed away on Tuesday in her sleep, a Gorilla Foundation press release said.

At birth, she was named Hanabi-ko -- Japanese for "fireworks child", because she was born at the San Francisco Zoo on July 4 in 1971. She was a western lowland gorilla.

"Her impact has been profound and what she has taught us about the emotional capacity of gorillas and their cognitive abilities will continue to shape the world," the Gorilla Foundation said.

Throughout her life, Koko's abilities made headlines. After she began communicating with humans through American Sign Language, she was featured by National Geographic - and she took her own picture (in a mirror) for the magazine's cover.

That cover came out in 1978, seven years after Koko was chosen as an infant to work on a language research project with the psychologist Francine "Penny" Patterson.

In 1985, the magazine profiled the affectionate relationship between the gorilla and her kitten: Koko and All Ball.

Koko, who also apparently understood some spoken English. Instructors taught her a version of American Sign Language and say she used it to convey thoughts and feelings, the BBC reported.

She adopted and named pets, including her kitten, All Ball.

Some scientists have cast doubt on the extent of the gorilla's communicative skills. However, she was the subject of many documentaries.

When her tailless tabby kitten All Ball escaped and was killed by a car in 1984, Dr Patterson wrote that she had displayed grief.

Koko lived most of her life at the Gorilla Foundation in California. She was filmed meeting the late actor Robin Williams in 2001.

Koko amazed scientists in 2012, when she showed she could learn to play the recorder. The feat revealed mental acuity but also, crucially, that primates can learn to intricately control their breathing - something that had been assumed to be beyond their abilities.

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Gaborone (Botswana) (PTI): Amoj Jacob and Ragul Kumar got injured during the men's 4x400m and 4x100 races respectively as India ended their World Athletics Relays campaign in disappointment on the second day of competitions here on Sunday.

The Indian camp had high hopes of making the 2027 World Championships in the men's 4x400m relay but the team did not finish (DNF) the race as Jacob suffered cramps and pulled out of the race after taking the baton from the first leg runner Dharamveer Choudhary. Rajesh Ramesh and Vishal TK were to run in the third and fourth legs.

Those teams which could not qualify for the 2027 Beijing World Championships by reaching the final round of each of the six relay events on Saturday were given another chance in the second qualification round on Sunday.

The top two teams in each of the two heats (in all six relay events) booked the Beijing ticket on Sunday.

India will now have to try and qualify for the World Championships through the Top Lists of the World Athletics, which is a long and tedious process.

In the men's 4x100m race, third leg runner Ragul Kumar fell down the track after failing to hand over the baton inside the exchange zone to fourth leg runner Gurindervir Singh, which clearly showed the lack of coordination among the runners.

Harsh Santosh Raut and Animesh Kujur ran the first two legs.

The Indian quartet was disqualified and Kumar was seen being taken away from the Field of Play with the help of the volunteers.

It was a comedy of errors in the case of the women's 4x100m race, which saw the baton being dropped during an exchange between first leg runner Tamanna and second runner Nithya Gandhe, though the Indians finished the race in 53.09 seconds.

Gandhe started running quite a distance, but after realising that the baton was not in her hand, she turned and ran back to pick it up.

The only silver-lining for the Indian contingent was the national record time in the mixed 4x100m relay race, though the quartet of Ragul Kumar, Nithya Gandhe, Animesh Kujur and Sneha SS finished sixth in heat number two with a time of 41.35 seconds, bettering the previous national mark of 42.30 seconds set in March in Chandigarh.

The mixed 4x400m relay quartet of Theerthesh P Shetty, Kumari Saloni, Nihal William and Rashdeep Kaur ended at fifth in heat number one with a time of 3 minutes and 19.40 seconds.

On Saturday, all the five Indian relay teams had failed to make it to the respective final rounds and thus missed out on the 2027 World Championships berths.