Many studies report a greater abundance of male than female moths in light trap catches. The finding was interpreted as evidence for male‐biased attraction to light, but alternatives could not be ruled out. For example, it is not known, how much the sex ratio in the catches deviates from the natural sex ratio. To overcome these limitations, we experimentally tested the flight‐to‐light behavior of two moth species, Yponomeuta cagnagella (Hübner) (Lepidoptera: Yponomeutidae) and Ligdia adustata (Denis and Schiffermüller) (Lepidoptera: Geometridae), under standardized conditions in an enclosed environment. In our test, we controlled the sex ratio, age, and population size. We recorded the moths caught in the trap and those that remained outside. Depending on the species, between 27 and 72% of all moths were caught in the light trap. We found that male moths were significantly and about 1.6 times more frequently attracted to the light than female moths. Our results were consistent for both species and hold good on the level of populations. We experimentally supported the general observation of a sexual dimorphism in the flight‐to‐light behavior of moths. Possible functional explanations include different flight activities of males and females or differences in the perception of light between males and females. Our experimental demonstration of a sexual dimorphism in the flight‐to‐light behavior of moths together with the common observation of an overrepresentation of males in light traps and other artificial light sources has implications for population and conservation biology.

Among the many genes involved in the metabolism of therapeutic drugs, human arylamine N -acetyltransferases ( NATs ) genes have been extensively studied, due to their medical importance both in pharmacogenetics and disease epidemiology. One member of this small gene family, NAT2 , is established as the locus of the classic human acetylation polymorphism in drug metabolism. Current hypotheses hold that selective processes favoring haplotypes conferring lower NAT2 activity have been operating in modern humans’ recent history as an adaptation to local chemical and dietary environments. To shed new light on such hypotheses, we investigated the genetic diversity of the three members of the NAT gene family in seven hominid species, including modern humans, Neanderthals and Denisovans. Little polymorphism sharing was found among hominids, yet all species displayed high NAT diversity, but distributed in an opposite fashion in chimpanzees and bonobos ( Pan genus) compared to modern humans, with higher diversity in Pan species at NAT1 and lower at NAT2 , while the reverse is observed in humans. This pattern was also reflected in the results returned by selective neutrality tests, which suggest, in agreement with the predicted functional impact of mutations detected in non-human primates, stronger directional selection, presumably purifying selection, at NAT1 in modern humans, and at NAT2 in chimpanzees. Overall, the results point to the evolution of divergent functions of these highly homologous genes in the different primate species, possibly related to their specific chemical/dietary environment (exposome) and we hypothesize that this is likely linked to the emergence of controlled fire use in the human lineage.

Proactive information donation is crucial for human cumulative cultural evolution. Evidence for proactive information donation in nonhuman animals is limited to a few examples, and its evolutionary origin remains debated. Here, we examine the role of cooperative breeding for the evolution of proactive information donation by comparing cooperatively breeding common marmosets and an independently breeding sister taxon, the squirrel monkeys, in a series of food sharing experiments. Food sharing was virtually absent in squirrel monkeys but highly prevalent in marmosets. Furthermore, experienced adult marmosets shared more food with immatures when food was more difficult than easy-to-access. This increase was mainly driven by the experienced adults, who proactively initiated sharing more often in the difficult condition, consistent with proactive information donation. These notable species differences have significant implications for the evolution of information donation in cooperatively breeding humans and its absence in other great apes who all breed independently.

Social learning is of universal importance to animal life and communication is likely to foster it. How do animals recognise when others produce actions that lead to relevant new information? To address this, we exposed four chimpanzees to an arbitrary learning task, a two-choice visual discrimination paradigm presented on a touch screen that led to food rewards. In each trial, images were paired with one of four acoustic treatments: 1) relevant or 2) irrelevant chimpanzee calls ('rough grunts' to food; 'pant grunts' to a dominant conspecific), 3) a mechanical noise (hammer knocking sounds) 4) silence. As we were interested in the effect of food calls on learning speed as compared to control stimuli, each chimpanzee was tested with the food call treatment, and one of the three control stimuli (either the pant grunt, mechanical noise or silence condition). We found that learning was significantly enhanced in the contextually correct 'rough grunt' condition, suggesting that food calls may play a role in the cultural transmission of food preferences, by priming individuals about a learning opportunity. We discuss these findings and propose that, at least in chimpanzees, the enhancing effect of these vocalisations may be related to the way they affect receivers' motivational/emotional and attentional systems.

Social learning is beneficial in almost every domain of a social animal's life, but it is particularly important in the context of predation and foraging. In both contexts, social animals tend to produce acoustically distinct vocalizations, alarms, and food calls, which have remained somewhat of an evolutionary conundrum as they appear to be costly for the signaller. Here, we investigated the hypothesis that food calls function to direct others toward novel food items, using a playback experiment on a group of chimpanzees. We showed chimpanzees novel (plausibly edible) items while simultaneously playing either conspecific food calls or acoustically similar greeting calls as a control. We found that individuals responded by staying longer near items previously associated with food calls even in the absence of these vocalizations, and peered more at these items compared with the control items, provided no conspecifics were nearby. We also found that once chimpanzees had access to both item types, they interacted more with the one previously associated with food calls than the control items. However, we found no evidence of social learning per se. Given these effects, we propose that food calls may gate and thus facilitate social learning by directing listeners' attention to new feeding opportunities, which if integrated with additional cues could ultimately lead to new food preferences within social groups.