... Indriidae Rainfall Seasonality Sleep trees Temperature All species within the animal kingdom engage in sleep, which has been defined as a reversible state of inactivity and unconsciousness with diminished responsiveness to external stimuli [Rasch and Born, 2013]. Most non-human primates exhibit...

..., the black-and-white ruffed lemur ( Varecia variegata ), at an undisturbed primary rain forest site in Ranomafana National Park, Madagascar, and characterize sex differences in annual home range area, overlap, and daily distances traveled. Moreover, we characterize seasonal variability in range use and ask...

...) shift their activity pattern from being cathemeral in the dry season to being diurnal in the wet season. From July 2015 to March 2016, we collected data on active behaviour of brown lemurs over 46 full-day and 33 full-night observations, distributed evenly between the dry and wet seasons. This study...

..., with a dry season from November to May (43.7 ± 25.8 mm), and a rainy season between June and October (218.9 ± 14.1 mm). The mean annual temperature is 26°C. We studied 14 groups of black howler monkeys that lived in different locations in Campeche [described in Dias et al., 2014, 2015a, 2016, 2018...

... of their locomotion, focusing on the extent that seasonal variation in climate and habitat, and local variation in habitat, is reflected in changes in locomotor behaviour. P . verreauxi is a committed leaper with a strong preference for vertical and angled supports. We found clear between-group differences in support...

...Larissa Swedell; Getenet Hailemeskel; Amy Schreier Here we report the first year-round quantitative data on dietary composition and seasonality in wild hamadryas baboons. Study subjects were adult male members of band 3 at the Filoha field site in central lowland Ethiopia. Data collection consisted...

...Fred B. Bercovitch; Robert S.O. Harding Most cercopithecines reproduce on a seasonal basis, but the proximate mechanisms influencing birth periodicity are often unclear. We analyze 10 years of data from the Gilgil Baboon Project (Kenya) in order to examine the relationship between annual birth...

...Eleanor J. Sterling The lemurs of Madagascar typically exhibit a strictly seasonal pattern of breeding, with a limited number of successive estrous cycles occurring at a particular time of the year, which varies from species to species. Previous reports indicated that aye-ayes also exhibit...

...Martine Perret Environmental factors that regulate the sexual activity of male lesser mouse lemurs have been studied experimentally with more than 60 captive animals over an 8-year period. In this nocturnal Malagasy prosimian, variation in day length is the primary factor controlling seasonal...

... responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements. Drinking Alouatta caraya Howler monkey Rainfall Brazil Water source Seasonality Brief Report Folia Primatol 1992;58:107-111 Julio César...

... close to (within 500 km of) the southern limit of the range of the species group. We examine the proposition that, due to greater seasonality of climate and food availability at southern latitudes, samango activity patterns define the extent of the behavioural response capabilities of the C. mitis...

...Renate Foerg The reproductive behavior of 20 captive Cheirogaleus medius was studied over two breeding seasons in 1980 and 1981. Seasonality, estrous cycle, sexual behavior, sexual maturity, and postpartum estrus are described. Reproduction of the different species of the family Cheirogaleidae...

...Ranka Sekulic Daytime and seasonal patterns of roaring and spacing are described for the red howler monkey, Alouatta seniculus . A seasonal difference in howling at midday during the dry season is correlated with high temperature and high insolation. Interacting troops come closer to each other...

...Andreas Paul; Dieter Thommen Examined were 5 years of data on the reproduction of a semifree-ranging population of Barbary macaques (Macaca sylvanus). In this seasonally breeding species – birth season: mid-March to beginning of August – primiparous 4-year-old females gave birth significantly later...

...Michael Kavanagh The feeding behaviour of representative groups of tantalus monkeys (Cercopithecus aethiops tantalus) was observed during 1974–1975 in three habitats in Cameroon. Observations took place during the wet and dry seasons in sahelian savannah, guinea savannah and farmed forest...

... as the interaction of moonlight effects with other exogenous factors. We analyzed long-term automated activity recordings obtained with accelerometer collars from 7 owl monkeys during 2003 and 2004. Our data show marked lunar periodic and seasonal modulations of the owl monkeys’ activity pattern. On full moon days...

... seasonal variation in behavioural flexibility in response to annual cycles of day length. While short day lengths are an important constraint on the activity of the baboons at De Hoop Nature Reserve, South Africa, long summer days permit considerable flexibility in thermoregulatory response, diet selection...

... or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements. Capuchin monkey Testicular volume Seasonality Cebus apella Brief Report Folia...

... Biologie Animale, Université d Antananarivo, et c Madagascar Fauna Group, Toamasina, Madagascar; d Department of Anthropology, University of Illinois, Urbana-Champaign, Ill., USA Key Words Primates ` Indriidae ` Madagascar ` Feeding ecology ` Seasonality ` Postures ` Support use ` Vertical space...

...Julia Ostner Pronounced seasonality, with temperatures dropping as low as 5°C during the dry season, has led to the hypothesis that Malagasy lemurs face cold stress and respond to this by inactivity and social thermoregulation, i.e. resting in tight body contact with conspecifics. Compared...