| Giant Panda | |||
|---|---|---|---|
| |||
| General information | |||
| Universe | Real Life | ||
| Aliases | Panda Bear Mo (貘) | ||
| Classification | Ailuropoda melanoleuca melanoleuca | ||
| Species type | Panda | ||
| Homeworld | Earth | ||
| Environment | China | ||
| Intelligence | Non-sapient | ||
| Biochemistry | Carbon-based lifeform | ||
| Discovered | China: By 157 BC Western World: March 11, 1869 | ||
| Discoverer | China: Unknown Western World: Father Armand David | ||
| Biological information | |||
| Lifespan | Wild: 20 years Captivity: 30 years | ||
| Reproduction | Sexual; gives live birth | ||
| Average height | 60 to 90 cm (24 to 35 in) at shoulder | ||
| Average weight | ♂: 160 kg (350 lb) ♀: 70-125 kg (150-276 kg) | ||
| Average length | 1.2 to 1.9 metres (3 feet 11 inches to 6 feet 3 inches) w/o tail | ||
| Locomotion | Quadrupedal | ||
| Feeding behavior | Omnivorous | ||
| Prey | Bamboo | ||
| Predators | Predators that hunt adults: Humans (illegally) Predators that hunt sub-adults: Leopards Predators that hunt cubs: Snow leopards Yellow-throated martens Eagles Feral dogs Asian black bears | ||
| Distinctive features | Black patches | ||
| Eye color | Black | ||
| Lineage information | |||
| Subspecies | A. m. melanoleuca | ||
| Related species | Pygmy giant panda† Ailuropoda wulingshanensis† Ailuropoda baconi† | ||
| Cultural information | |||
| Alignment | True Neutral | ||
| Sociocultral characteristics | |||
| Members | Bai Yun, Bao Bao, Bei Bei, Chuang Chuang, Da Mao, Er Shun, Gao Gao, Gu Gu, Hua Mei, Jia Panpan, Jia Yueyue,Lin Bing, Lin Hui, Lun Lun, Mei Lan, Mei Sheng, Mei Xiang, Po, Su Lin, Tai Shan, Tian Tian (male), Tian Tian (female), Tuan Tuan, Wang Wang, Xi Lan, Xiao Liwu, Xian Xian, Xin Xin, Yang Yang, Yang Guang, Yuan Zai, Yuan Yuan, Yun Zi Basi, Chi Chi, Chu-Lin, Hsing-Hsing, Ling Ling (male), Ling-Ling (female), Ming Ming, Shi Shi, Su Lin, Tao Tao, Tohui, Xiang Xiang | ||
| Scientific taxonomy | |||
| Planet | Earth | ||
| Domain | Eukaryota | ||
| Kingdom | Animalia | ||
| Subkingdom | Eumetazoa | ||
| Infrakingdom | Bilateria | ||
| Superphylum | Deuterostomia | ||
| Phylum | Chordata | ||
| Subphylum | Vertebrata | ||
| Superclass | Tetrapoda | ||
| Class | Mammalia | ||
| Subclass | Theria | ||
| Infraclass | Placentalia | ||
| Superorder | Laurasiatheria | ||
| Order | Carnivora | ||
| Suborder | Caniformia | ||
| Infraorder | Arctoidea | ||
| Family | Ursidae | ||
| Subfamily | Ailuropodinae | ||
| Genus | Ailuropoda | ||
| Species | A. melanolueca | ||
| Subspecies | A. m. melanoleuca | ||
| Other information | |||
| Status | Vulnerable | ||
| Creator | God (debated) | ||
| First sighting | By 157 BC | ||
| Last sighting | Current | ||
| Possible population | 200-300 | ||
The giant panda (Ailuropoda melanolueca melanolueca) is one of the only pandas alive today besides the Qiling panda.
Description[]
The giant panda has luxuriant black-and-white fur. Adults measure around 1.2 to 1.9 metres (3 feet 11 inches to 6 feet 3 inches) long, including a tail of about 10–15 cm (4–6 in), and 60 to 90 cm (24 to 35 in) tall at the shoulder. Males can weigh up to 160 kg (350 lb). Females (generally 10–20% smaller than males) can weigh as little as 70 kg (150 lb), but can also weigh up to 125 kg (276 lb). The average weight for adults is 100 to 115 kg (220 to 254 lb).
The giant panda has a body shape typical of bears. It has black fur on its ears, eye patches, muzzle, legs, arms and shoulders. The rest of the animal's coat is white. Although scientists do not know why these unusual bears are black and white, speculation suggests that the bold colouring provides effective camouflage in their shade-dappled snowy and rocky habitat, and that their eye patches might facilitate them identifying one another. The giant panda's thick, woolly coat keeps it warm in the cool forests of its habitat. The panda's skull shape is typical of durophagous carnivorans. It has evolved from previous ancestors to exhibit larger molars with increased complexity and expanded temporal fossa. A 110.45 kg (243.5 lb) giant panda has a 3D canine teeth bite force of 2603.47 newtons and bite force quotient of 292. Another study had a 117.5 kg (259 lb) giant panda bite of 1298.9 newtons (BFQ 151.4) at canine teeth and 1815.9 newtons (BFQ 141.8) at carnassial teeth.
The giant panda's paw has a "thumb" and five fingers; the "thumb" – actually a modified sesamoid bone – helps it to hold bamboo while eating. Stephen Jay Gould discusses this feature in his book of essays on evolution and biology, The Panda's Thumb.
The giant panda's tail, measuring 10 to 15 cm (4 to 6 in), is the second-longest in the bear family, behind the sloth bear.
The giant panda typically lives around 20 years in the wild and up to 30 years in captivity. A female named Jia Jia was the oldest giant panda ever in captivity, born in 1978 and died at an age of 38 on 16 October 2016.
Pathology[]
A seven-year-old female named Jin Yi died in 2014 in a zoo in Zhengzhou, China, after showing symptoms of gastroenteritis and respiratory disease. It was found that the cause of death was toxoplasmosis, a disease caused by an obligate intracellular parasitic protozoan known as Toxoplasma gondii that infects most warm-blooded animals, including humans.
Genomics[]
The giant panda genome was sequenced in 2009 using Illumina dye sequencing. Its genome contains 20 pairs of autosomes and one pair of sex chromosomes.
Ecology[]
Diet[]
Despite its taxonomic classification as a carnivoran, the giant panda's diet is primarily herbivorous, consisting almost exclusively of bamboo. However, the giant panda still has the digestive system of a carnivore, as well as carnivore-specific genes, and thus derives little energy and little protein from consumption of bamboo. Its ability to digest cellulose is ascribed to the microbes in its gut. Pandas are born with sterile intestines and require bacteria obtained from their mother's feces to digest vegetation. The giant panda is a highly specialised animal with unique adaptations, and has lived in bamboo forests for millions of years.
The average giant panda eats as much as 9 to 14 kg (20 to 30 lb) of bamboo shoots a day to compensate for the limited energy content of its diet. Ingestion of such a large quantity of material is possible and necessary because of the rapid passage of large amounts of indigestible plant material through the short, straight digestive tract. It is also noted, however, that such rapid passage of digesta limits the potential of microbial digestion in the gastrointestinal tract, limiting alternative forms of digestion. Given this voluminous diet, the giant panda defecates up to 40 times a day. The limited energy input imposed on it by its diet has affected the panda's behavior. The giant panda tends to limit its social interactions and avoids steeply sloping terrain to limit its energy expenditures.
Two of the panda's most distinctive features, its large size and round face, are adaptations to its bamboo diet. Anthropologist Russell Ciochon observed: "[much] like the vegetarian gorilla, the low body surface area to body volume [of the giant panda] is indicative of a lower metabolic rate. This lower metabolic rate and a more sedentary lifestyle allows the giant panda to subsist on nutrient poor resources such as bamboo." Similarly, the giant panda's round face is the result of powerful jaw muscles, which attach from the top of the head to the jaw. Large molars crush and grind fibrous plant material.
The morphological characteristics of extinct relatives of the giant panda suggest that while the ancient giant panda was omnivorous 7 million years ago (mya), it only became herbivorous some 2–2.4 mya with the emergence of A. microta. Genome sequencing of the giant panda suggests that the dietary switch could have initiated from the loss of the sole T1R1/T1R3 umami taste receptor, resulting from two frameshift mutations within the T1R1 exons. Umami taste corresponds to high levels of glutamate as found in meat and may have thus altered the food choice of the giant panda. Although the pseudogenisation of the umami taste receptor in Ailuropoda coincides with the dietary switch to herbivory, it is likely a result of, and not the reason for, the dietary change. The mutation time for the T1R1 gene in the giant panda is estimated to 4.2 mya while fossil evidence indicates bamboo consumption in the giant panda species at least 7 mya, signifying that although complete herbivory occurred around 2 mya, the dietary switch was initiated prior to T1R1 loss-of-function.
Pandas eat any of 25 bamboo species in the wild, such as Fargesia dracocephala and Fargesia rufa. Only a few bamboo species are widespread at the high altitudes pandas now inhabit. Bamboo leaves contain the highest protein levels; stems have less.
Because of the synchronous flowering, death, and regeneration of all bamboo within a species, the giant panda must have at least two different species available in its range to avoid starvation. While primarily herbivorous, the giant panda still retains decidedly ursine teeth and will eat meat, fish, and eggs when available. In captivity, zoos typically maintain the giant panda's bamboo diet, though some will provide specially formulated biscuits or other dietary supplements.
Pandas will travel between different habitats if they need to, so they can get the nutrients that they need and to balance their diet for reproduction. For six years, scientists studied six pandas tagged with GPS collars at the Foping Reserve in the Qinling Mountains. They took note of their foraging and mating habits and analyzed samples of their food and feces. The pandas would move from the valleys into the Qinling Mountains and would only return to the valleys in autumn. During the summer months, bamboo shoots rich in protein are only available at higher altitudes which causes low calcium rates in the pandas. During breeding season, the pandas would return to lower altitudes to eat bamboo leaves rich in calcium.
Predators[]
Although adult giant pandas have few natural predators other than humans, young cubs are vulnerable to attacks by snow leopards, yellow-throated martens, eagles, feral dogs, and the Asian black bear. Sub-adults weighing up to 50 kg (110 lb) may be vulnerable to predation by leopards.
Behavior[]
The giant panda is a terrestrial animal and primarily spends its life roaming and feeding in the bamboo forests of the Qinling Mountains and in the hilly province of Sichuan. Giant pandas are generally solitary. Each adult has a defined territory and a female is not tolerant of other females in her range. Social encounters occur primarily during the brief breeding season in which pandas in proximity to one another will gather. After mating, the male leaves the female alone to raise the cub.
Pandas were thought to fall into the crepuscular category, those who are active twice a day, at dawn and dusk; however, Jindong Zhang found that pandas may belong to a category all of their own, with activity peaks in the morning, afternoon and midnight. Due to their sheer size, they can be active at any time of the day. Activity is highest in June and decreases in late summer to autumn with an increase from November through the following March. Activity is also directly related to the amount of sunlight during colder days.
Pandas communicate through vocalisation and scent marking such as clawing trees or spraying urine. They are able to climb and take shelter in hollow trees or rock crevices, but do not establish permanent dens. For this reason, pandas do not hibernate, which is similar to other subtropical mammals, and will instead move to elevations with warmer temperatures. Pandas rely primarily on spatial memory rather than visual memory.
Though the panda is often assumed to be docile, it has been known to attack humans, presumably out of irritation rather than aggression.
Pandas have been known to cover themselves in horse manure to protect themselves against cold temperatures.
Reproduction[]
Initially, the primary method of breeding giant pandas in captivity was by artificial insemination, as they seemed to lose their interest in mating once they were captured. This led some scientists to try extreme methods, such as showing them videos of giant pandas mating and giving the males sildenafil (commonly known as Viagra). Only recently have researchers started having success with captive breeding programs, and they have now determined giant pandas have comparable breeding to some populations of the American black bear, a thriving bear species. The normal reproductive rate is considered to be one young every two years.
Giant pandas reach sexual maturity between the ages of four and eight, and may be reproductive until age 20. The mating season is between March and May, when a female goes into estrus, which lasts for two or three days and only occurs once a year. When mating, the female is in a crouching, head-down position as the male mounts her from behind. Copulation time ranges from 30 seconds to five minutes, but the male may mount her repeatedly to ensure successful fertilisation. The gestation period is somewhere between 95 and 160 days - the variability is due to the fact that the fertilized egg may linger in the reproductive system for a while before implanting on the uterine wall.
Giant pandas give birth to twins in about half of pregnancies. If twins are born, usually only one survives in the wild. The mother will select the stronger of the cubs, and the weaker cub will die due to starvation. The mother is thought to be unable to produce enough milk for two cubs since she does not store fat. The father has no part in helping raise the cub.
When the cub is first born, it is pink, blind, and toothless, weighing only 90 to 130 g (3+1⁄4 to 4+1⁄2 oz), or about 1/800 of the mother's weight, proportionally the smallest baby of any placental mammal. It nurses from its mother's breast six to 14 times a day for up to 30 minutes at a time. For three to four hours, the mother may leave the den to feed, which leaves the cub defenseless. One to two weeks after birth, the cub's skin turns grey where its hair will eventually become black. Slight pink colour may appear on the cub's fur, as a result of a chemical reaction between the fur and its mother's saliva. A month after birth, the colour pattern of the cub's fur is fully developed. Its fur is very soft and coarsens with age. The cub begins to crawl at 75 to 80 days; mothers play with their cubs by rolling and wrestling with them. The cubs can eat small quantities of bamboo after six months, though mother's milk remains the primary food source for most of the first year. Giant panda cubs weigh 45 kg (100 pounds) at one year and live with their mothers until they are 18 months to two years old. The interval between births in the wild is generally two years.
In July 2009, Chinese scientists confirmed the birth of the first cub to be successfully conceived through artificial insemination using frozen sperm. The cub was born at 07:41 on 23 July that year in Sichuan as the third cub of You You, an 11-year-old. The technique for freezing the sperm in liquid nitrogen was first developed in 1980 and the first birth was hailed as a solution to the dwindling availability of giant panda semen, which had led to inbreeding. Panda semen, which can be frozen for decades, could be shared between different zoos to save the species. It is expected that zoos in destinations such as San Diego in the United States and Mexico City will now be able to provide their own semen to inseminate more giant pandas. In August 2014, a rare birth of panda triplets was announced in China; it was the fourth of such births ever reported.
Attempts have also been made to reproduce giant pandas by interspecific pregnancy where cloned panda embryos were implanted into the uterus of an animal of another species. This has resulted in panda fetuses, but no live births.