Studies of hunters and gatherers — and of chimpanzees, which are often used as stand-ins for human ancestors — have cast bigger, faster and more powerful males in the hunter role.
Now, a 10-year study of chimpanzees in Senegal shows females playing an unexpectedly big role in hunting and males, surprisingly, letting smaller and weaker hunters keep their prey.
The results do not overturn the idea of dominant male hunters, said Jill Pruetz of Iowa State University, who led the study. However, they may offer a new frame of reference on hunting, tools and human evolution. “We need to broaden our perspective,” she said.
Illustration: Yusha
Among the 30 or so chimps Pruetz and her colleagues observed, called the Fongoli band, males caught 70 percent of the prey, mostly by chasing and running it down. However, these chimps are very unusual in one respect. They are the only apes that regularly hunt other animals with tools — broken tree branches. And females do the majority of that hunting for small primates called bush babies.
Craig Stanford, an anthropologist at the University of Southern California who has written extensively on chimp hunting and human evolution, said the research was “really important” because it solidified the evidence for chimps hunting with tools, which Pruetz had reported in earlier papers.
It also clearly shows “the females are more involved than in other places,” he said, adding that it provides new evidence to already documented observations that female chimps are “much more avid tool users than males are.”
All chimpanzees eat a variety of plant and animal foods, including insects like termites. And all chimpanzees eat some other animals. The most familiar examples of chimpanzee hunting are bands of the apes chasing red colobus monkeys through the trees in the rain forests of East Africa.
In this kind of pursuit, the largest, strongest, fastest chimps dominate — and those are adult males. When females and smaller chimps do catch an animal, an adult male may simply take it away, although the meat is eventually shared. The theft rate in other groups of chimps is around 25 percent, Pruetz said. Those other chimps do not hunt with tools.
The Fongoli chimpanzees live in a mix of savanna and woodlands where prey is not as abundant as in rain forests. There are no red colobus monkeys, and although the chimps do hunt young vervet monkeys and baboons, the much smaller bush babies are their main prey.
Pruetz argues that less food may have prompted both technological and social innovation, resulting in new ways to hunt and new social interactions as well. Humans evolved in a similar environment, and, as she and her colleagues write in Royal Society Open Science, “tool-assisted hunting could have similarly been important for early hominins.”
The tools in question are broken branches that Pruetz calls jabbing tools. The season for bush baby hunting is June, when the temperature may be well over 38?C and the humidity is suffocating. The Fongoli chimps find the bush babies in their dens in trees. Chimps will stab and poke one of the small animals, sometimes wounding but not impaling it, until it comes out of its hiding place. The chimps will grab it, Pruetz said, and immediately “bite the head off.”
Females, even those with infants, and juvenile chimps can do this kind of hunting. The process does not put a premium on speed and strength as the chase does, so big males do not have an advantage. However, there is more than technique and technology involved. There is social change.
By and large, said Pruetz, the adult males, which could take away a kill, show a “respect of ownership.” Theft rates are only about 5 percent. The chimps she studies also have more mixed-sex social groups than chimp bands in East Africa.
Travis Pickering, an anthropologist at the University of Wisconsin, said that with less food available it seems that the Fongoli chimps, “have to be more inventive” and that “these hunting weapons even the playing field for non-adults and females.”
Early hominins may have been in a similar situation, he said. Hunting among human ancestors “very quickly became a male-dominated activity,” he said, but “female hominins could very well have been the inventors of weapons.”
When it comes to getting food, deciding who does what depends on definitions. Collecting insects, for example, is defined as gathering, not hunting. In the case of the bush babies, however, though they are small, they struggle and flee, and will bite. Any bite, no matter how small, can pose the danger of infection, so the pursuit of bush babies qualifies as hunting, Pruetz says, and Stanford and Pickering agree.
Russian President Vladimir Putin’s hypersonic missile carried a simple message to the West over Ukraine: Back off, and if you do not, Russia reserves the right to hit US and British military facilities. Russia fired a new intermediate-range hypersonic ballistic missile known as “Oreshnik,” or Hazel Tree, at Ukraine on Thursday in what Putin said was a direct response to strikes on Russia by Ukrainian forces with US and British missiles. In a special statement from the Kremlin just after 8pm in Moscow that day, the Russian president said the war was escalating toward a global conflict, although he avoided any nuclear
Would China attack Taiwan during the American lame duck period? For months, there have been worries that Beijing would seek to take advantage of an American president slowed by age and a potentially chaotic transition to make a move on Taiwan. In the wake of an American election that ended without drama, that far-fetched scenario will likely prove purely hypothetical. But there is a crisis brewing elsewhere in Asia — one with which US president-elect Donald Trump may have to deal during his first days in office. Tensions between the Philippines and China in the South China Sea have been at
US President-elect Donald Trump has been declaring his personnel picks for his incoming Cabinet. Many are staunchly opposed to China. South Dakota Governor Kristi Noem, Trump’s nomination to be his next secretary of the US Department of Homeland Security, said that since 2000, China has had a long-term plan to destroy the US. US Representative Mike Waltz, nominated by Trump to be national security adviser, has stated that the US is engaged in a cold war with China, and has criticized Canada as being weak on Beijing. Even more vocal and unequivocal than these two Cabinet picks is Trump’s nomination for
An article written by Uber Eats Taiwan general manager Chai Lee (李佳穎) published in the Liberty Times (sister paper of the Taipei Times) on Tuesday said that Uber Eats promises to engage in negotiations to create a “win-win” situation. The article asserted that Uber Eats’ acquisition of Foodpanda would bring about better results for Taiwan. The National Delivery Industrial Union (NDIU), a trade union for food couriers in Taiwan, would like to express its doubts about and dissatisfaction with Lee’s article — if Uber Eats truly has a clear plan, why has this so-called plan not been presented at relevant
RSS