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Post by brobear on Jan 2, 2020 14:04:42 GMT -5
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Post by King Kodiak on Jun 4, 2020 17:32:40 GMT -5
MOUNTAIN GORILLA (GORILLA BERINGEI BERINGEI)
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Post by King Kodiak on Jul 12, 2020 15:37:28 GMT -5
Brobear, i just found the average weight of the Mountain gorilla (Gorilla beringei beringei), its from the best source, Dian Fossey, this is the subspecie that she studied. I had posted this on page 11 of this thread, but i will post it again: THE AVERAGE IS 375 LBS.
domainofthebears.proboards.com/post/30301/thread
Group sizes vary from two to twenty animals, And average about 10 individuals. a typical group contains: one silverback, a sexually mature male over the age of fifteen years who is the group's undisputed leader and weights roughly 375 lbs or about twice the size of a female, one blackback, a sexually immature male between eight and thirteen years weighting some 253 lbs, three to four sexually mature females over eight years, each about 200 lbs, who are ordinarily bonded to the dominant silverback for life, and, lastly, from three to six immature members, those under eight years.
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Post by King Kodiak on Jul 12, 2020 15:40:02 GMT -5
Well that is very close to what Dian Fossey said above. She said Mountain gorillas weight on average 170 kg (375 lbs). So this definitely is a reliable average weight for this subspecies. This should be the second largest subspecies only to the Eastern lowland gorilla (Gorilla beringei graueri). Both of these subspecies are of course, part of the Eastern gorilla species (Gorilla Beringei)
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Post by brobear on Jul 13, 2020 3:13:18 GMT -5
www.wwf-congobasin.org/eastern_gorilla.cfm The eastern lowland gorilla—also known as Grauer’s gorilla—is the largest of the four gorilla subspecies. It is distinguished from other gorillas by its stocky body, large hands and short muzzle. Despite its size, eastern lowland gorillas subsist mainly on fruit and other plants. www.gorillas-world.com/eastern-lowland-gorilla/ The anatomy of the eastern lowland gorilla (Gorilla beringei graueri) is robust and big. There is sexual dimorphism as males are larger and heavier than females; on average, an adult male height is 1.69 meters and weighs 163 kilograms, while adult females are about 1.60 meters heigh and weight little more than 81 kg. The largest eastern lowland gorillas are in zoos, and they can reach more than 250 kilograms. They have a strong skeleton with a big skull compared to the size of the rest of their body, a short snout and a jawbone with teeth. Their arms are long and very developed, longer in males than in females. Their thumbs are longer than the rest of the fingers. Like all gorillas, they walk relaying their weight on their knuckles. The skin of all gorillas is thick, and the eastern lowland gorilla is no exception. They have a deep layer called the dermis and an outer layer, the epidermis, besides a layer of fat that help them to keep their body temperature stable. Their dark fur coat is shorter than the mountain gorilla, and the hair is absent in the face, hands, feet, and ears. *163 kilograms is equal to 359.35 pounds.
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Post by OldGreenGrolar on Aug 22, 2020 8:22:49 GMT -5
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Post by King Kodiak on Aug 22, 2020 10:34:51 GMT -5
This is great news. This is all due to the conservation work of Dian Fossey. If it wasn't for her, the mountain gorilla would probably be extinct by now.
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Post by King Kodiak on Dec 28, 2020 12:37:00 GMT -5
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Post by brobear on Jan 17, 2021 6:02:18 GMT -5
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Post by brobear on Jan 23, 2021 15:46:13 GMT -5
Eastern Gorillas:
Mountain gorilla ( Gorilla beringei beringei )
Eastern lowland gorilla ( Gorilla beringei graueri )
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Post by King Kodiak on Jan 23, 2021 20:12:14 GMT -5
EASTERN LOWLAND GORILLA (GORILLA BERINGEI GRAUERI)
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Post by brobear on Feb 3, 2021 3:01:56 GMT -5
I searched for a definition for the word: BERINGEI. Well, it seems that there is no such word. ?
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Post by King Kodiak on Feb 4, 2021 2:24:30 GMT -5
I searched for a definition for the word: BERINGEI. Well, it seems that there is no such word. ? "Beringei" was put in the honor of the man who discovered this species. His name was "von Beringe"
Captain von Beringe, together with a physician, Dr. Engeland, a Corporal Ehrhardt, and twenty local troops with equipment and native porters left Usumbura in German East Africa on 19 August 1902. Their destination was the King Yuhi V of Rwanda. They then headed north to the volcanic Virunga Mountains.[1] On 17 October 1902 he shot two large apes that were unknown to science at the time. He sent them to the Natural History Museum in Berlin, where they were examined and documented by Paul Matschie. The species was named Gorilla beringei in his honor, a gorilla species distinct from the previously discovered western gorilla ("Gorilla gorilla"). This new species, commonly called "eastern gorilla", was later determined to consist of two subspecies: the mountain gorilla (Gorilla beringei beringei) and the eastern lowland gorilla (Gorilla beringei graueri).
en.m.wikipedia.org/wiki/Friedrich_Robert_von_Beringe
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Post by brobear on Feb 4, 2021 2:51:08 GMT -5
Mystery solved. Thanks Kodiak. I was searching for a word; figured it to be most likely Latin. Never considered a person's name.
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Post by OldGreenGrolar on Feb 4, 2021 19:18:50 GMT -5
Reply 10. This gorilla has a greenish hue probably due to reflecting light.
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Post by King Kodiak on Mar 17, 2021 18:28:18 GMT -5
Observations of severe and lethal coalitionary attacks in wild mountain gorillas
Abstract and Figures
In humans and chimpanzees, most intraspecific killing occurs during coalitionary intergroup conflict. In the closely related genus Gorilla, such behavior has not been described. We report three cases of multi-male, multi-female wild mountain gorilla (G. beringei) groups attacking extra-group males. The behavior was strikingly similar to reports in chimpanzees, but was never observed in gorillas until after a demographic transition left ~25% of the population living in large social groups with multiple (3+) males. Resource competition is generally considered a motivator of great apes’ (including humans) violent intergroup conflict, but mountain gorillas are non-territorial herbivores with low feeding competition. While adult male gorillas have a defensible resource (i.e. females) and nursing/pregnant females are likely motivated to drive off potentially infanticidal intruders, the participation of others (e.g. juveniles, sub-adults, cycling females) is harder to explain. We speculate that the potential for severe group disruption when current alpha males are severely injured or killed may provide sufficient motivation when the costs to participants are low. These observations suggest that the gorilla population’s recent increase in multi-male groups facilitated the emergence of such behavior, and indicates social structure is a key predictor of coalitionary aggression even in the absence of meaningful resource stress.
Figure 1. Hand lacerations from the 2004 attack
Figure 2. Pablo group members gather during the 2010 attack; the victim was in the center of the surrounding animals.
www.researchgate.net/publication/310475080_Observations_of_severe_and_lethal_coalitionary_attacks_in_wild_mountain_gorillas
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Post by OldGreenGrolar on Mar 18, 2021 4:15:00 GMT -5
I believe silverback gorillas are only territorial towards other males because of their females. They are said to be non territorial because it is easier for them to find food compared to pure carnivores.
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Post by King Kodiak on Apr 9, 2021 6:58:23 GMT -5
Chest beats as an honest signal of body size in male mountain gorillas (Gorilla beringei beringei)
Abstract
Acoustic signals that reliably indicate body size, which usually determines competitive ability, are of particular interest for understanding how animals assess rivals and choose mates. Whereas body size tends to be negatively associated with formant dispersion in animal vocalizations, non-vocal signals have received little attention. Among the most emblematic sounds in the animal kingdom is the chest beat of gorillas, a non-vocal signal that is thought to be important in intra and inter-sexual competition, yet it is unclear whether it reliably indicates body size. We examined the relationship among body size (back breadth), peak frequency, and three temporal characteristics of the chest beat: duration, number of beats and beat rate from sound recordings of wild adult male mountain gorillas. Using linear mixed models, we found that larger males had significantly lower peak frequencies than smaller ones, but we found no consistent relationship between body size and the temporal characteristics measured. Taken together with earlier findings of positive correlations among male body size, dominance rank and reproductive success, we conclude that the gorilla chest beat is an honest signal of competitive ability. These results emphasize the potential of non-vocal signals to convey important information in mammal communication.
Full study here:
www.nature.com/articles/s41598-021-86261-8
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Post by brobear on Apr 29, 2021 5:40:27 GMT -5
en.wikipedia.org/wiki/Kahuzi-Bi%C3%A9ga_National_Park The Kahuzi-Biega National Park is a protected area near Bukavu town in eastern Democratic Republic of the Congo. It is situated near the western bank of Lake Kivu and the Rwandan border. Established in 1970 by the Belgian photographer and conservationist Adrien Deschryver, the park is named after two dormant volcanoes, Mount Kahuzi and Mount Biega, which are within its limits. With an area of 6,000 square kilometres (2,300 sq mi), Kahuzi-Biega is one of the biggest national parks in the country. Set in both mountainous and lowland terrain, it is one of the last refuges of the rare species of Eastern lowland gorilla (Gorilla beringei graueri), an endangered category under the IUCN Red List. The park is a UNESCO World Heritage Site, inscribed in 1980 for its unique biodiversity of rainforest habitat and its eastern lowland gorillas. Bonane, Kahuzi Biega, DRC, 2020.
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Post by brobear on May 28, 2021 4:59:19 GMT -5
www.sci-news.com/biology/mountain-gorillas-friendly-familiar-neighbors-09002.html Mountain Gorillas are Friendly to Familiar Neighbors, New Study Finds. Mountain gorillas (Gorilla beringei beringei) live in tight-knit groups, foraging, resting and sleeping together around a core home range and a wider peripheral range. These groups sometimes split permanently, separating gorillas that may have lived together for years and may be closely related. A new study, published in the Journal of Animal Ecology, shows groups of gorillas that were previously united are more than four times as likely to be friendly to each other when they meet, even if they had split over a decade earlier.
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