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Post by oldindigosilverback on May 29, 2023 3:39:56 GMT -5
/\ Chimps see leopards as a natural threat more so than the lion. Lions focus on bigger prey but leopards include chimps in their menu.
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Post by Gorilla king on May 30, 2023 10:26:53 GMT -5
That's right, and sometimes pay for it because chimps absolutely hate leopards as shown by several accounts in this thread.
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Post by Gorilla king on Jun 14, 2023 10:52:43 GMT -5
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Post by Gorilla king on Sept 23, 2023 22:05:05 GMT -5
Lean muscle mass, not aggression, mediates a link between dominance rank and testosterone in wild male chimpanzees
Abstract
Testosterone promotes mating effort, which involves intraspecific aggression for males of many species. Therefore, males with higher testosterone levels are often thought to be more aggressive. For mammals living in multimale groups, aggression is hypothesized to link male social status (i.e. dominance rank) and testosterone levels, given that high status predicts mating success and is acquired partly through aggressive intragroup competition. In male chimpanzees, Pan troglodytes, dominance rank has been repeatedly linked to interindividual variation in testosterone levels, but evidence directly linking interindividual variation in testosterone and aggression is lacking. In the present study, we test both aggression levels and lean muscle mass, as measured by urinary creatinine, as links between dominance rank and testosterone levels in a large sample of wild male chimpanzees. Multivariate analyses indicated that dominance rank was positively associated with total rates of intragroup aggression, average urinary testosterone levels and average urinary creatinine levels. Testosterone was positively associated with creatinine levels but negatively associated with total aggression rates. Furthermore, mediation analyses showed that testosterone levels facilitated an association between dominance rank and creatinine levels. Our results indicate that (1) adult male chimpanzees with higher average testosterone levels are often higher ranking but not more aggressive than males with lower testosterone and (2) lean muscle mass links dominance rank and testosterone levels in Ngogo males. We assert that aggression rates are insufficient to explain links between dominance rank and testosterone levels in male chimpanzees and that other social variables (e.g. male-male relationship quality) may regulate testosterone's links to aggression.
www.researchgate.net/publication/372102374_Lean_muscle_mass_not_aggression_mediates_a_link_between_dominance_rank_and_testosterone_in_wild_male_chimpanzees
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Post by Gorilla king on Nov 6, 2023 6:52:00 GMT -5
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Post by Gorilla king on Nov 14, 2023 10:35:46 GMT -5
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Post by Gorilla king on Nov 27, 2023 17:52:15 GMT -5
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Post by Gorilla king on Dec 29, 2023 11:04:40 GMT -5
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Post by Gorilla king on Jan 3, 2024 23:51:03 GMT -5
CHIMP KILLS MONKEY:
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Post by Gorilla king on Jan 9, 2024 22:01:00 GMT -5
A case of suspected chimpanzee scavenging in the Issa Valley, Tanzania
Abstract
Like humans, chimpanzees (Pan troglodytes) are well known for their vertebrate and invertebrate hunting, but they rarely scavenge. In contrast, while hunting and meat consumption became increasingly important during the evolution of the genus Homo, scavenging meat and marrow from carcasses of large mammals was also likely to be an important component of their subsistence strategies. Here, we describe a confrontational scavenging interaction between an adult male chimpanzee from the Issa Valley and a crowned eagle (Stephanoaetus coronatus), which resulted in the chimpanzee capturing and consuming the carcass of a juvenile bushbuck (Tragelaphus scriptus). We describe the interaction and contextualize this with previous scavenging observations from chimpanzees.
www.researchgate.net/publication/375115125_A_case_of_suspected_chimpanzee_scavenging_in_the_Issa_Valley_Tanzania
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