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endangered animals

作者:高考题库网
来源:https://www.bjmy2z.cn/gaokao
2021-03-01 05:53
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2021年3月1日发(作者:priori)


Giant panda


This article is about the mammal in the bear family. For the red panda,


see


Red panda


. For the hip hop group, see


Giant Panda (group)


. For other


uses, see


Panda (disambiguation)



The


giant panda


, or


panda


(


Ailuropoda melanoleuca


, literally meaning


cat-foot


[2]


is a bear


[3]


native to central- western and south western China.


[4]


It is easily recognized


by its large, distinctive black patches around the eyes, over the ears, and across its round body.


Though it belongs to the order


Carnivora


, the panda's diet is 99%


bamboo


.


[5]


Pandas in the wild


will occasionally eat other grasses, wild tubers, or even meat in the form of birds, rodents or


carrion. In captivity they may receive honey, eggs, fish, yams,


shrub leaves


, oranges, or bananas


along with specially prepared feed.


[6][7]


The giant panda lives in a few mountain ranges in central


China, mainly in


Sichuan


province, but also in the


Shaanxi


and


Gansu


provinces.


[8]


Due to farming,


deforestation


and other development, the panda has been driven out of the lowland areas where it


once panda is a


conservation reliant



endangered species


.


[4]


A 2007 report shows 239


pandas living in captivity inside China and another 27 outside the country.


[9]


Wild population


estimates vary; one estimate shows that there are about 1,590 individuals living in the wild,


[9]



while a 2006 study via


DNA analysis


estimated that this figure could be as high as 2,000 to


3,000.


[10]


Some reports also show that the number of pandas in the wild is on the rise.


[11][12]



However, the


IUCN


does not believe there is enough certainty yet to reclassify the species from


Endangered to Vulnerable.


[1]


While the


dragon


has historically served as China's


national emblem


,


in recent decades the panda has also served as an emblem for the country. Its image appears on a


large number of modern Chinese commemorative silver, gold, and platinum coins. Though the


panda is often assumed to be docile, it has been known to attack humans, presumably out of


irritation rather than predation.


Diet


Despite its


taxonomic


classification as a


carnivoran


, the


giant panda's


diet


is primarily


herbivorous


, consisting almost exclusively of bamboo.


[22]


However,


the giant panda still has the digestive system of a carnivore, as well as carnivore- specific genes,


[30]



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.


[31]


The giant panda is a


with


[25]


The average


giant panda eats as much as 9 to 14 kg (20 to 30 pounds) of bamboo shoots a day. Because the


giant panda consumes a diet low in nutrition, it is important for it to keep its digestive tract full.


[22]



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 in order to limit its


energy expenditures.


[32]


Two of the panda's most distinctive features, its large size and its round


face, are


adaptations


to its bamboo diet. Panda researcher


Russell Ciochon



observed that: “[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


allow the giant panda to subsist on nutrient poor resources such as bamboo.”


[32]


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.


[32]


Large molars crush and grind fibrous plant eat any of


twenty-five bamboo species in the wild, such as


Fargesia dracocephala


[33]


and


Fargesia rufa


.


[34]



Only a few bamboo species are widespread at the high altitudes pandas now inhabit. Bamboo


leaves contain the highest protein levels; stems have less.


[35]


Given this large diet, the giant panda


can defecate up to 40 times a day.


[36]


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


Golden snub-nosed monkey


The


golden snub-nosed monkey


(


Rhinopithecus roxellana


) is an


Old World


monkey


in the


Colobinae


subfamily.


[1]


It is


endemic


to a small area in


temperate, mountainous


forests


of


central


and


Southwest China


.


[3]


The


Chinese


name


is


sichuan


golden


hair


monkey


(


川金丝猴


).


It


is


also


widely


referred


to


as


the


sichuan


snub-nosed


monkey.


[4][5][6]



Snow


occurs


frequently


within its range and it can withstand colder average temperatures than


any


other


non-human


primates.


[7]



Its


diet


varies


markedly


with


the


seasons,


but


it


is


primarily


an


herbivore


with


lichens



being


its


main


food


source.


It is diurnal and largely arboreal, spending some 97% of their time in


the canopy. There are three subspecies. Population estimates range from


8,000 to 15,000 and it is threatened by


habitat loss


.


[2]


The adult and


subadult golden snub-nosed monkey is


sexually dimorphic


. Adult males


(estimated at over 7 years of age) have large bodies covered with very


long,


golden


guard


hairs



on


their


backs


and


cape


area.


The


crest


is


medium


brown


while


the


back,


crown



to


nape


,


arms


and


outer


thighs


are


deep


brown.


Subadult


males


(estimated


at


5



7


years


of


age)


are


more


slender


than


adult


males.


The


golden


guard


hairs


are


short


and


sparse,


and


their


crests


show


females (estimated at over 5 years of age) are about


half the size of adult males. The golden guard hairs are also present on


the


back


and


cape


area,


but


they


are


shorter


in


length


than


in


the


males.


The brown crest shows


microbanding


. Their breasts and nipples are


lt females are about two-thirds the size of adult females.


The body hair is brown, gradually turning golden but without the golden


guard hairs. The crest shows microbanding. The breasts and nipples are


not as large as in adult les (at least 1 year of age) are


quite small, being less than two-thirds the size of adult females. The


body


hair


is


light


brown,


turning


reddish


gold


with


time.


The


rest


of


their


body hair is brown. Sexual discrimination is difficult because their


external genital organs are underdeveloped. Infants (age 3 months to a


year)


are


light


brownish


gray


or


light


brown,


appearing


white


in


sunlight.


Their


sex


cannot


be


identified


at


this


age.


Newborn


babies


(


under


3


months

-


-


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