The Mexican grizzly bear (''Ursus arctos horribilis'', formerly ''Ursus arctos nelsoni'') is an

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

population Population typically refers to the number of people in a single area, whether it be a city or town, region, country, continent, or the world. Governments typically quantify the size of the resident population within their jurisdiction usi ...

of the

grizzly bear The grizzly bear (''Ursus arctos horribilis''), also known as the North American brown bear or simply grizzly, is a population or subspecies of the brown bear inhabiting North America. In addition to the mainland grizzly (''Ursus arctos horri ...

Mexico Mexico (Spanish language, Spanish: México), officially the United Mexican States, is a List of sovereign states, country in the southern portion of North America. It is borders of Mexico, bordered to the north by the United States; to the so ...

. The

holotype A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of seve ...

was shot by H. A. Cluff at Colonia Garcia,

Chihuahua Chihuahua may refer to: Places * Chihuahua (state), a Mexican state **Chihuahua (dog), a breed of dog named after the state **Chihuahua cheese, a type of cheese originating in the state **Chihuahua City, the capital city of the state **Chihuahua Mu ...

in 1899. The extinct

California grizzly bear The California grizzly bear (''Ursus arctos californicus'') is an extinct population or subspecies of the brown bear, generally known (together with other North American brown bear populations) as the grizzly bear. "Grizzly" could have meant " ...

extended slightly south into

Baja California Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Mex ...

. The bears in

Durango Durango (), officially named Estado Libre y Soberano de Durango ( en, Free and Sovereign State of Durango; Tepehuán: ''Korian''; Nahuatl: ''Tepēhuahcān''), is one of the 31 states which make up the 32 Federal Entities of Mexico, situated in ...

Sonora Sonora (), officially Estado Libre y Soberano de Sonora ( en, Free and Sovereign State of Sonora), is one of the 31 states which, along with Mexico City, comprise the Federal Entities of Mexico. The state is divided into 72 municipalities; the ...

and central Mexico were likely more related to the bears of Arizona, New Mexico and Texas than to those of California.

Description

Known in the Opatas language as the , the grizzly was one of the heaviest and largest mammals in Mexico. It reached a length up to and an average weight of . Due to its silver fur, it was often named in Spanish as ''el oso plateado'' (the silvery bear). This bear was also described to have been of a dark color and only rarely with a reddish coat. The Mexican grizzly was smaller than the grizzlies in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...

and

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by to ...

. The general color was pale buffy yellow varying to grayish-white, grizzled from the darker color of the underfur. Specimens in worn pelage varied to yellowish-brown and reddish. The longest fur hairs were on the throat and the flanks. The belly was sparsely haired, lacking the thick underfur of the back and the flanks.

Range and habitat

The bear inhabited the northern territories of Mexico, in particular the temperate grasslands and mountainous pine forests. Its previous range reached from across Aridoamerica, from

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...

New Mexico ) , population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano) , seat = Santa Fe, New Mexico, Santa Fe , LargestCity = Albuquerque, New Mexico, Albuquerque , LargestMetro = Albuquerque metropolitan area, Tiguex , Offi ...

Texas Texas (, ; Spanish: ''Texas'', ''Tejas'') is a state in the South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by ...

and Mexico. It seems unlikely that the bears would have hibernated although they may have spent some time in winter dens.

Biology

Like all

brown bear The brown bear (''Ursus arctos'') is a large bear species found across Eurasia and North America. In North America, the populations of brown bears are called grizzly bears, while the subspecies that inhabits the Kodiak Islands of Alaska is k ...

s, Mexican grizzlies were

omnivore An omnivore () is an animal that has the ability to eat and survive on both plant and animal matter. Obtaining energy and nutrients from plant and animal matter, omnivores digest carbohydrates, protein, fat, and fiber, and metabolize the nu ...

s. Their diet mainly consisted of plants, fruits and insects, and it is reported that it was very fond of ants, like most brown bears. Occasionally it fed also on small mammals and carrion. Females produced one to three cubs every three years or so.

mtDNA Phylogeny

This bear is within Mitochondrial DNA (mtDNA) Clade 4, as are all of the extant NA brown bears.

Extinction

The first Europeans to come in contact with the Mexican grizzly were the

conquistador Conquistadors (, ) or conquistadores (, ; meaning 'conquerors') were the explorer-soldiers of the Spanish and Portuguese Empires of the 15th and 16th centuries. During the Age of Discovery, conquistadors sailed beyond Europe to the Americas, ...

s in the 16th century, when

Francisco Vásquez de Coronado Francisco is the Spanish and Portuguese form of the masculine given name '' Franciscus''. Nicknames In Spanish, people with the name Francisco are sometimes nicknamed " Paco". San Francisco de Asís was known as ''Pater Comunitatis'' (father o ...

went on an expedition to find the

Seven Cities of Gold The myth of the Seven Cities of Gold, also known as the Seven Cities of Cibola (), was popular in the 16th century and later featured in several works of popular culture. According to legend, the seven cities of gold referred to Aztec mythology r ...

. His expedition began in

Mexico City Mexico City ( es, link=no, Ciudad de México, ; abbr.: CDMX; Nahuatl: ''Altepetl Mexico'') is the capital and largest city of Mexico, and the most populous city in North America. One of the world's alpha cities, it is located in the Valley o ...

in 1540, and went north to

and the

Great Plains The Great Plains (french: Grandes Plaines), sometimes simply "the Plains", is a broad expanse of flatland in North America. It is located west of the Mississippi River and east of the Rocky Mountains, much of it covered in prairie, steppe, a ...

in the modern-day U.S. states of

and

Kansas Kansas () is a U.S. state, state in the Midwestern United States, Midwestern United States. Its Capital city, capital is Topeka, Kansas, Topeka, and its largest city is Wichita, Kansas, Wichita. Kansas is a landlocked state bordered by Nebras ...

. Because the bears hunted the cattle from time to time, they were considered as pests by farmers. Grizzlies were trapped, shot and poisoned, and had already become scarce by the 1930s. Its former range decreased to the three isolated mountains, Cerro Campana, Cerro Santa Clara, and Sierra del Nido north of Chihuahua City, within the State of Chihuahua. By 1960, only 30 individuals were said to remain. Despite its protected status, the hunting continued. By 1964, the Mexican grizzly was regarded as being extinct. After rumours of some surviving individuals on a ranch at the headwaters of the

Yaqui River The Yaqui River (Río Yaqui in Spanish) (Hiak Vatwe in the Yaqui or Yoreme language) is a river in the state of Sonora in northwestern Mexico. It was formerly known as the Rio del Norte. Being the largest river system in the state of Sonora, th ...

in the state of

in 1968, American biologist Dr. Carl B. Koford went on a three-month survey but without success. A grizzly was shot in 1976 in Sonora, the fourth confirmed in Sonora, and the first in many decades. The Mexican grizzly is now presumed to be extinct, or perhaps only extirpated.

References

External links

Endangered Species Handbook Persecution and Hunting - Bears
{{Arctos Grizzly bears Extinct bears Endemic mammals of Mexico Extinct animals of Mexico Mammal extinctions since 1500 Species made extinct by deliberate extirpation efforts Bear, Mexican Natural history of the Mexican Plateau