primatology

An international team has studied dominance relationships between the sexes in 253 populations of 121 different primate species. The data collected indicate that clear dominance by one sex or the other is rare, despite the fact that it was long believed that males dominated females socially in most of them. According to the press release accompanying the paper, the work “challenges traditional views on the natural origins of gender roles.” The results are published in the journal PNAS. 

The frequency of aggressive coalitions among female bonobos is associated with greater power over males, according to a study published in Communications Biology. The analysis is based on observations of six wild bonobo communities in the Democratic Republic of Congo between 1993 and 2021.

One characteristic that is considered distinctive of human language is its capacity to combine elements and form more complex and meaningful structures, which is known as compositionality. Its most complex form, in which meaning is not simply the result of the sum of words, has not been found in any other animal species. Now, an international team claims to have observed it for the first time in bonobos. The results, published in Science, call into question assumptions about the uniqueness of human language and open up new avenues for understanding the evolution of communication, according to the journal.

Chimpanzees can learn a new skill by observing each other — a phenomenon known as social learning — according to a study published in Nature Human Behaviour. The findings suggest that chimpanzees may have the capacity for cumulative cultural evolution, which was previously considered to be an exclusively human trait.

The vast majority of mammals remain fertile until the end of their lives. Humans and some species of whales deviate from that norm and do go through menopause. Now, research published in Science reveals that menopause exists in female chimpanzees, too, and that it lasts for a fifth of their adult lifespan. To reach these conclusions, the research team observed 185 female chimpanzees between 1995 and 2016 in Uganda's Kibale National Park and measured hormone levels in urine samples from specimens of various ages.

An international study published in the journal PNAS has associated deforestation and climate change with different species of monkeys and lemurs that usually live in trees spending more time on the ground. This implies that they would be exposed to a greater number of hazards. The research has taken place in 47 species in different parts of the Americas and Madagascar.