Pandas come in different shades, and scientists now understand why | CNN (2024)

Pandas come in different shades, and scientists now understand why | CNN (1)

Qizai, a brown giant panda in captivity who was at the center of the scientific study, is seen on May 28, 2021.

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With its striking coloration, the giant pandais an instantly recognizable species.

A handful of giant pandas that aren’t black-and-white, however, do exist. These majestic creatures with brown-and-white fur inhabit a single mountain range in China. And now, scientists may have unraveled the mystery of the extremely rare pandas’ unusual coats, according to new research.

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The work, which involved studying the genetics of multiple pandas in the wild and in captivity, has suggested that pandas with brown-and-white coatsare the result of natural variation, rather than a sign of inbreeding in a dwindling population.

The first brown panda known to science was a female named Dandan. A local ranger found the ailing bear in Foping County in Shaanxi province’s Qinling Mountains in March 1985. The panda was held in captivity until her death in 2000.

Since Dandan’s discovery decades ago, there have been 11 reported sightings documented through official news sources or personal accounts shared with the authors of this latest study that appeared in the journal PNAS on March 4.

“The recurring instances of brown pandas imply that this trait may be inheritable. However, to date, the genetic basis underlying the brown-and-white coat color remains unclear,” the authors wrote.

Gaining a better understanding of the distinctive coloration could help inform efforts to breed brown-and-white pandas in captivity, said senior author Dr. Fuwen Wei, a professor of wildlife ecology and conservation biologyat the Chinese Academy of Sciences’ Institute of Zoology in Beijing. The status of the giant panda as a species is vulnerable, according to the International Union for Conservation of Nature Red List of Threatened Species.

Pandas come in different shades, and scientists now understand why | CNN (3)

A wild giant panda in China's Qinling Mountains stares at the camera in March 2016.

A panda family tree

To understand what lies behind the trait, the researchers studied Qizai, a male brown panda rescued as a cub in 2009 from Foping National Nature Reserve in Hanzhong. He is currently the only brown panda in captivity.

When compared under a microscope with hair samples from three black-and-white pandas, Qizai’s brownish fur had fewer and smaller melanosomes, tiny structures found in cells that are responsible for skin and hair pigment in mammals. What’s more, the melanosomes were more likely to be irregularly shaped, the study team found.

The researchers then gathered genetic information about Qizai and pieced together his family tree. Fresh scat, or bear poop, gathered at the nature reserve revealed the identity of his wild mother, a black-and-white female panda that wears a tracking collar and is known as Niuniu.

The researchers also identified Qizai’s son, a black-and-white panda born in captivity in 2020. (The study team later identified Qizai’s father, Xiyue, a wild but tracked black-and-white panda, by studying the genetics of a wider population of pandas.)

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The scientists studied the genetic information from Qizai’s family members and compared it with the genetic information from 12 black-and-white pandas from the Qinling Mountains and 17 black-and-white pandas from other regions in China using information taken from scat and blood samples.

While none of Qizai’s immediate family members had brown fur, the researchers were able to show that his parents and son all had one copy of the recessive trait on a gene known as Bace2, while Qizai had two copies.

An individual’s genes can carry recessive traits, such as blue eyes or red hair in humans, without appearing as a physical characteristic. Each parent must possess a copy of the genetic variant and pass it on in order for the trait to appear in the offspring, as is the case with Qizai.

Genetic analysis solves an enigma

Thanks to an analysis of a tissue sample stored for more than two decades in ethanol, the scientists also were able to sequence the genome of Dandan, the first known brown panda. Dandan had the same recessive trait, the researchers found.

The scientists then conducted a wider analysis of 192 black-and-white giant pandas to verify the responsible gene as Bace2. The mutation causing the brown coats was only present in two pandas hailing from the Qinling Mountains in Shaanxi, not Sichuan province, where the majority of China’s giant pandas live.

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To confirm the findings, the scientists used the CRISPR-Cas9 gene-editing tool to delete the genetic sequence they had identified as causing the mutation in the Bace2 gene in 78 lab mice. The change reduced the number and size of melanosomes in the mice.

“The coat color of knockout mice is light brown,” said Wei, who is also president at Jiangxi Agricultural Universityin Nanchang in China’s Jiangxi province.

“It proves that this deletion has the potential to alter the coat color of a mouse, as the pigmentation pathway is relatively conserved (shared) among mammals. Therefore, it is very likely that this mutation influences the coat color of a brown panda.”

Natural variation vs. inbreeding

It’s not clear what caused the genetic mutation. Wei said it must be linked to the specific environment of the Qinling Mountains, which has a different climate than Sichuan. The genetic mutation did not appear to be a result of inbreeding, as once suspected, he said.

“It is more likely to be a result of natural variation rather than inbreeding. Our kinship analysis indicates that Qizai’s parents are not closely related,” Wei added.

Tiejun Wang, an associate professor in the department of natural resources at the University of Twente in the Netherlands, said it was good news that the unique coloration did not appear to be the result of inbreeding. Wang, who has studied brown pandas, was not involved in the study.

“For those who are concerned about this species, this is a positive development,” said Wang, who said he worked as a field ranger in the mountains for 10 years.

Wang said he applauded the team “for their tremendous efforts in trying to shed light on this scientific question.”

Pandas come in different shades, and scientists now understand why | CNN (2024)

FAQs

Pandas come in different shades, and scientists now understand why | CNN? ›

The work, which involved studying the genetics of multiple pandas in the wild and in captivity, has suggested that pandas with brown-and-white coats are the result of natural variation, rather than a sign of inbreeding in a dwindling population.

Why do scientists think pandas are black and white? ›

By matching reflectance (the amount of light reflected) from the giant panda's fur with natural objects in the background, we discovered that their black fur patches blend in with dark shades and with tree trunks, whereas their white patches match bright foliage and snow when present.

How do pandas communicate with other pandas that they never see? ›

Most of their communication is accomplished through scent marking throughout their habitat and territory. Giant pandas mark their territory by rubbing secretions from their anal glands onto tree trunks, rocks or the ground, usually along paths that they habitually tread.

Why are there so few pandas in the world? ›

Infrastructure development (such as dams, roads, and railways) is increasingly fragmenting and isolating panda populations, preventing pandas from finding new bamboo forests and potential mates. Forest loss also reduces pandas' access to the bamboo they need to survive.

Do pandas come in different colors? ›

Pandas aren't all black and white. Some come in a different shade, and scientists now understand why. Qizai, a brown giant panda in captivity who was at the center of the scientific study, is seen on May 28, 2021.

Are black and white pandas going extinct? ›

That trend prompted the country to announce, in 2021, that pandas are no longer endangered. (The International Union for the Conservation of Nature, the global authority on endangered animals, delisted pandas in 2016.) Imagine that: The panda, the very symbol of endangered species, is no longer endangered.

Do pandas eat meat? ›

Bamboo contains very little nutritional value so pandas must eat 12-38kg every day to meet their energy needs. But they do branch out, with about 1% of their diet comprising other plants and even meat. While they are almost entirely vegetarian, pandas will sometimes hunt for pikas and other small rodents.

What is the IQ of a panda? ›

It is not possible to accurately measure the IQ of pandas, as the concept of intelligence quotient (IQ) is a human-centric measurement and does not translate well to other species.

How long do pandas eat a day? ›

Pandas, a member of the bear family, typically lead a solitary life. They are excellent tree climbers, but they spend most of their time feeding. They can eat for 14 hours a day, mainly bamboo, which is 99% of their diet (though they sometimes eat eggs or small animals too).

Will red pandas go extinct? ›

Red pandas are endangered and are legally protected in India, Bhutan, China, Nepal and Myanmar. Their primary threats are habitat loss and degradation, human interference and poaching. Researchers believe that the total population of red pandas has declined by 40 percent over the past two decades.

What happens if pandas go extinct? ›

If pandas were to go extinct, China's bamboo forests would greatly suffer since pandas help spread bamboo seeds that they pass in their feces. By spreading these seeds, they help bamboo plants to spread and grow. The Chinese use bamboo for making utensils and medicine and as food and fuel.

Does Mexico own pandas? ›

Shaun Shaun died in 2022, leaving Xin Xin as the last surviving panda in Mexico. The pandas at Chapultepec are special in that China does not have ownership. The original pair was given to Mexico and subsequent pandas have all been born prior to the change in policy from gifting to loaning.

What are baby pandas called? ›

Answer and Explanation: A baby panda is called a cub. This is a pretty common name for the young of several species.

How many hours do pandas sleep? ›

Pandas are quite sleepy Pandas spend a big portion of their days snoozing. In fact, when they're not foraging for their favorite food - bamboo - most pandas spend their days sleeping or lying around. For that reason, a panda may spend up to 12 hours a day resting or napping.

Are black and white pandas real? ›

The giant panda (Ailuropoda melanoleuca), also known as the panda bear or simply panda, is a bear species endemic to China. It is characterised by its bold black-and-white coat and rotund body. The name "giant panda" is sometimes used to distinguish it from the red panda, a neighboring musteloid.

Are pandas always black and white? ›

He says pandas are black and white because their environments are snowy in the winter and hot in the summer. “It's a sort of compromise pattern,” says Caro. “Some animals change the colour of their coat seasonally – say brown in summer and white in winter – but this animal doesn't do that.”

Where do black and white pandas come from? ›

Pandas, also known as giant pandas, are native to central China, specifically in the mountainous regions of Sichuan, Shaanxi, and Gansu provinces.

Do pandas have black and white stripes True or false? ›

The study, a collaboration between the University of California, Davis, and California State University, Long Beach, determined that the giant panda's distinct black-and-white markings have two functions: camouflage and communication.

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