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Article
Open AccessIndependent fitness consequences of group size variation in Verreaux’s sifakas
The costs and benefits of group living are also reflected in intraspecific variation in group size. Yet, little is known about general patterns of fitness consequences of this variation. We use demographic rec...
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Article
Open AccessStillbirth of a mandrill (Mandrillus sphinx) in the wild: perinatal behaviors and delivery sequences
Birth is a fundamental event in the life of animals, including our own species. More reports of wild non-human primate births and stillbirths are thus needed to better understand the evolutionary pressures sha...
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Article
Open AccessDrivers and consequences of female reproductive competition in an egalitarian, sexually monomorphic primate
Even after the 150th anniversary of sexual selection theory, the drivers and mechanisms of female sexual selection remain poorly studied. To understand demographic circumstances favoring female-female competit...
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Article
Open AccessAuthor Correction: Adult sex ratios: causes of variation and implications for animal and human societies
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Article
Open AccessAdult sex ratios: causes of variation and implications for animal and human societies
Converging lines of inquiry from across the social and biological sciences target the adult sex ratio (ASR; the proportion of males in the adult population) as a fundamental population-level determinant of beh...
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Article
Open AccessInterrelationship among spatial cohesion, aggression rate, counter-aggression and female dominance in three lemur species
How social and ecological factors are associated with variation in dominance style across species of animals has been studied frequently, but the underlying processes are often not addressed. Theoretical resea...
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Article
Open AccessHonest signaling in mouse lemur vocalizations?
Animal vocalizations may provide information about a sender’s condition or motivational state and, hence, mediate social interactions. In this study, we examined whether vocalizations of gray mouse lemurs (Microc...
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Article
Open AccessSex-specific movement ecology of the shortest-lived tetrapod during the mating season
Sex-specific reproductive strategies are shaped by the distribution of potential mates in space and time. Labord’s chameleon (Furcifer labordi) from southwestern Madagascar is the shortest-lived tetrapod whose li...
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Article
Open AccessSex differences in audience effects on anogenital scent marking in the red-fronted lemur
How the presence of conspecifics affects scent mark deposition remains an understudied aspect of olfactory communication, even though scent marking occurs in different social contexts. Sex differences in scent...
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Article
Open AccessQuantifying within-group variation in sociality—covariation among metrics and patterns across primate groups and species
It has long been recognized that the patterning of social interactions within a group can give rise to a social structure that holds very different places for different individuals. Such within-group variation...
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Article
Open AccessDrivers of gut microbiome variation within and between groups of a wild Malagasy primate
Various aspects of sociality can benefit individuals’ health. The host social environment and its relative contributions to the host-microbiome relationship have emerged as key topics in microbial research. Ye...
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Article
Infant Development and Maternal Care in Wild Verreaux’s Sifaka (Propithecus verreauxi)
Investigating factors influencing infant physical and social development is important to elucidate primate adaptations and life history evolution. Infant sifakas exhibit a puzzling mismatch between dental prec...
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Article
Open AccessMaternal stress effects on infant development in wild Verreaux's sifaka (Propithecus verreauxi)
Maternal effects mediated by nutrients or specific endocrine states of the mother can affect infant development. Specifically, pre- and postnatal maternal stress associated with elevated glucocorticoid (GC) ou...
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Article
Open AccessThe long lives of primates and the ‘invariant rate of ageing’ hypothesis
Is it possible to slow the rate of ageing, or do biological constraints limit its plasticity? We test the ‘invariant rate of ageing’ hypothesis, which posits that the rate of ageing is relatively fixed within ...
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Behavioural Biology: Content and History
Behavioural biology is a discipline of biology that uses scientific methods to study the behaviour of animals and humans. But what exactly is “behaviour“? Everyone probably has a spontaneous, concrete, and ver...
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Behaviour, Evolution and Life Histories
Modern evolutionary theory provides a theoretical framework for functional analyses of animal behaviour. In order to investigate the adaptive value of individual behaviour patterns, it is necessary to operatio...
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Orientation in Time and Space
The species-specific endowment of various sensory organs enables animals to perceive changes in their environment and respond accordingly. The vast majority of animals are exposed to temporal fluctuations in a...
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Predation
Eating and being eaten are closely related. Since many animals live entirely or partially on animal matter, the feeding behaviour of these predators has drastic negative consequences for the fitness of their p...
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Intrasexual Selection: How Males Compete
Although modern sex roles acknowledge the fact that males and females both compete for and chose mates, there are sound theoretical reasons for expecting massive sex differences in these behavioural domains. B...
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Parental Care
Parental care is defined as any activity by a parent that contributes to increasing the fitness of its offspring (Clutton-Brock 1991). It can begin before birth with the building of a nest or den for the eggs or ...
