America SAnimalsBearsMammals

Spectacled bear – Andean bear

Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)

Its closest relatives – the giant short-faced bear (Arctodus simus) and the  Florida spectacled bear / Florida cave bear (Tremarctos floridanus) – had long ceased to rule on Earth. The Andean bear, however, inherited their characteristic feature – a short, wide snout, which can also boast of the sun bear (Helarctos malayanus).


  • Kingdom: Animalia
  • Phylum: Chordata
  • Class: Mammalia
  • Order: Carnivora
  • Family: Ursidae
  • Genus: Tremarctos
  • Species: Spectacled bear (Tremarctos ornatus)
Spectacled bear, Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)


In rare cases, it has been found in eastern Panama (Central America), but virtually the entire population limits its range to the northern and western parts of South America, from western Venezuela, through Colombia, Ecuador, Peru, to Bolivia and northwestern Argentina. It lives almost exclusively in the Andes.

Before the population fragmented in the last 500 years, the species was considered very adaptable to a variety of habitats as it lives at different altitudes, including cloud forests, high-altitude grasslands, dry forests and scrub deserts. However, its favorite species is very humid mountain forests, because thanks to the high humidity, plants that are the best food growing there.

It rarely descends to a height of approx. 250 m (820 ft), usually it stays below 1,900 m (6,200 ft) (piedmonts / foothills), although it is also found on the border of snow, i.e. at over 5,000 m (16,000 ft) above sea level.

Spectacled bear, Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)



Medium-sized bear covered with blackish, long and fluffy fur, although individuals may differ in color, the shade of the coat varies between deep black, dark brown and even red. On the face, around the eyes and in the upper part of the chest, there is a distinctive beige or ginger-colored mark in the shape of glasses (hence the alternative name – spectacle bear), each individual has a unique pattern, thanks to which individual bears can be distinguished.

Males are approx. 3 times bigger than females and approx. 2 times heavier, as they can weigh 100-200 kg (220 to 440 lb), while females reach only 35 – 82 kg (77 – 181 lb).

The length of the body is from 120 to 200 cm (47 to 78.5 in), mature males usually do not exceed 150 cm (59 in), the tail is only about 7 cm (2.8 in), the height at the withers is in the range of 60 – 90 cm (23.5 to 35.5 in).

Compared to other modern bears, the Andean bear has a round face with a relatively short and wide mouth. According to scientists, extinct bears from the subfamily Tremarctinae, which also includes the Andean bear, had wide and massive snouts because they were adapted to a meat diet. In spectacled bear, such a structure of the head and mouth has little to do with the diet, because it prefers to eat plants.

Spectacled bear, Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)


Unlike its other cousins, the Andean bear is almost entirely herbivorous. It feeds on cacti, pineapple, palm nuts, bamboo, sunflowers, fallen fruit and palm leaves. Sometimes it tears off the top part of the bark to get to the second layer.

Many of these plants are hard to digest or difficult to open to most animals, so there is little competition and the animal does not have to worry about food supplies. In order to cope with problematic delicacies, it has been equipped with the largest zygomatic mandibular muscles in relation to body size.

In addition, it has the shortest snout of any living bear, which makes it similar to the giant panda (Ailuropoda melanoleuca). It is therefore no coincidence that both species are famous for eating virtually inedible plants.

Spectacled bear, Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)

It is also distinguished from other bears by its teeth – fourth premolars are adapted to cutting through hard fibers. This allows it to grind, cut and crush plant material. Therefore, it also eagerly eats sugar cane, honey, corn, and blueberries. When food is plentiful, approx. 9 individuals can live side by side.

It tastes meat very rarely, but if it does, it chooses llamas, deer, cattle, horses, rabbits, mice and birds that nest on the ground.

Sometimes accused of killing livestock, especially cattle, and destroying corn plantations. Indeed, it happens that an animal gets used to the taste of cattle meat, but does not kill it, but eats the carcass, so farmers who find the remains eaten believe that the cause of death was an attack by a bear.

Spectacled bear, Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)

Behavior, personality

It belongs to one of the few members of the family with a predominantly arboreal lifestyle (other examples are: the American black bear (Ursus americanus), the Asian black bear (Ursus thibetanus) and the sun bear (Helarctos malayanus), mentioned in the introduction).

In cloud forests, it can be active both during the day and at night, but in the Peruvian deserts it sleeps during the day. Its survival in the vicinity of humans depends primarily on its ability to climb the tallest trees, on which it builds nests to help hide and serve as a pantry or lair.

It leads a solitary life, having a tendency to isolate itself from other individuals – thus avoiding competition, because it is not territorial. It happens, however, that in food-rich areas these bears feed in small groups. The size of the area where one individual resides varies between 23 – 27 km2 (8.9 – 10 mi2) for males and 7-10 km2 (2.7 – 3.9 mi2) for females. In the dry season, these areas shrink.

When encountering humans or another bear, it shows submission and caution, unless the intruder is perceived as a threat to the female or her offspring – then it is better to be afraid, because mothers are able to attack.

In adulthood, it does not have any natural enemies, but the young often fall prey to pumas (Puma concolor) and jaguars (Panthera onca), although the latter shows different habitat preferences, rarely overlapping with bears. In addition, the Andean bear effectively avoids the areas of the spotted cat 🙂

In general, however, little is known about the spectacled bear despite being one of the largest land mammals in South America.

Spectacled bear, Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)


It can probably reproduce at any time of the year, but its breeding peak is between April and June, which is the rainy season when the fruit massively ripens. It creates a relationship that lasts 1-2 weeks, during which it often copulates with a partner.

After 5.5 months of pregnancy, i.e. in the dry season, from 1 to 3 young are born (quadruplets are rare). The newborns are blind and weigh between 300 and 330 g. Although this species does not give birth during the hibernation cycle, as North American bears do, they give birth in similar places – small caves. When the baby bears begin to see and walk, the mother leaves the safe hiding place with them.

The size of the litter is related to the weight of the female and the amount of available food (especially ripe fruit). The mother looks after the young for about 1 year, then they become independent. However, they will reach sexual maturity much later, in 4-7 years of age. Unfortunately, this information is based solely on observations of captive individuals.

Spectacled bear, Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)

Detailed data and dimensions (size)

Spectacled bear, Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)

  • Body length: 120 – 200 cm (3.9 – 6.5 ft), usually approx. 150 cm (4.9 ft), males are longer than females
  • Height at the withers: 60 – 90 cm (23.6 – 25.4 in)
  • Tail length: approx. 7 cm (2.7 in)
  • Weight:
    • males: 100 – 175 kg (max. 200 kg) / 220 – 386 lb (max. 440 lb)
    • females: 35 – 82 kg (77 – 181 lb).
  • Lifespan: probably approx. 20 years in the wild, approx. 30 years in captivity (the record holder from the Smithsonian National Zoological Park lived 36 years and 8 months)
Spectacled bear, Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)

Spectacled bear – interesting facts

  • The word-formation basis “Trem” comes from the Greek word for “hole”, Arctos is “bear” – the term Tremarctos is a reference to the unusual hole in the humerus. Ornatus from Latin means “ornament / decorate”, which is related to the spectacled pattern on the hair.
  • The spectacled bear is one of the smallest representatives of the bear family.
  • It is the only bear species found in South America.
  • Although scientifically speaking, it is the continent’s largest predator, only 5% of its diet is meat.
  • The “glasses” do not always completely surround the animal’s eyes, and sometimes the pattern does not exist at all.
  • Besides the giant panda, the Andean bear is the most herbivorous species of the modern bear.
  • So far, only one case has been reported in which a bear killed a human (the attack was caused by a shot).
  • The Andean bear is a very agile climber, it can sit on a tree for several days waiting for the fruit to ripen.
  • Wild population data show that there are fewer than 3,000 individuals in the Andes. The reason for the threat of extinction is habitat destruction, poaching for meat, and body parts (mainly the gallbladder) used as medicine in traditional Chinese medicine.
Spectacled bear, Andean bear, Andean short-faced bear, mountain bear (Tremarctos ornatus)


Dinosaur Database

We are a group of biologists and paleontologists, creating articles and popular science publications that present the world of animals, plants and introduce the nuances of paleontology in an accessible way for readers. All our articles are based on the most valuable sources and scientific works. Articles are also based on our own research and paleontological excavations. Our Databases: The largest Dinosaur Database: and The largest Pterosaur Database:

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button