The Ecology and Behaviour of Giraffe in Northern Botswana
Northern Botswana is one of the giraffe strongholds across its geographic range in the absence of, or with low impact from, the major anthropological threats faced elsewhere. Yet despite its conservation significance, until now, no giraffe specific ecological or behavioural studies have been undertaken. Moreover, Africa’s giraffe population has been significantly reduced over the last […]
Habitat heterogeneity and social factors drive behavioral plasticity in giraffe herd-size dynamics
Behavioral plasticity, or the mechanism by which an organism can adjust its behavior in response to exogenous change, has been highlighted as a potential buffer against extinction risk. Giraffes (Giraffa spp.) are gregarious, long-lived, highly mobile megaherbivores with a large brain size, characteristics that have been associated with high levels of behavioral plasticity. However, while […]
How social relationships of female giraffe (Giraffa camelopardalis tippelskirchi) change after calving
Giraffe (Giraffa camelopardalis) social structure is described as a fission–fusion society (Bercovitch & Berry, 2009; Shorrocks & Croft, 2009), wherein mother–daughter pairs and specific adult female dyads form strong, continuous social relationships (Bercovitch & Berry, 2013; Carter et al., 2013). Bercovitch & Berry (2013) found that in addition to related individuals, peers are more likely […]
Relationships between male giraffes’ colour, age and sociability
In species in which males signal competitive ability through secondary sexual traits, males with different levels of trait expression may adopt different reproductive tactics to maximize their reproductive success. In fission-fusion social systems, the most dominant males often roam widely in search of females in oestrus, and thus exhibit different patterns of sociability from subordinate […]
Current knowledge about the social organisation of giraffes
The Etosha Giraffe Research project in Namibia focuses on the social relationships among giraffes, which have previously been described as having little social structure nor strong bonds between individuals (Dagg and Foster, 1976; Le Pendu et al., 2000; Moss, 1976). Giraffes live in a fission-fusion society characterised by frequent changes of associates, with males adopting […]
Fission–fusion dynamics of a megaherbivore are driven by ecological, anthropogenic, temporal, and social factors
Fission–fusion dynamics hypothetically enable animals to exploit dispersed and ephemeral food resources while minimizing predation risk. Disentangling factors affecting group size and composition of fission–fusion species facilitates their management and conservation. We used a 6-year data set of 2888 group formations of Masai giraffes in Tanzania to investigate determinants of social group size and structure. […]
The impact of age-class and social context on fecal glucocorticoid metabolite levels in free-ranging male giraffes
One of the primary sources of perceived stress is the social environment of an animal and the interactions with conspecifics. An essential component of the response to a stressor is the activation of the hypothalamic–pituitary–adrenocortical axis, which results amongst others in a temporal increase in circulating glucocorticoid (GC) levels. Giraffes occur in a highly flexible […]
Seasonal changes in social networks of giraffes
Fission-fusion social societies allow animals to respond in a flexible manner to environmental changes by adapting the size and composition of a group. Although group members change frequently in these systems, associations with preferred partners may be found. In this study, we examined the grouping patterns of a population of 80 individual giraffes in a […]
Movement patterns and herd dynamics among South African giraffes (Giraffa camelopardalis giraffa)
Giraffes reside in a fission–fusion social system, with sex, age proximity, kinship and home range overlap accounting for some of the variance in herd composition, while season, sex, age and time of day influence diet, home range size and distance travelled. To increase our knowledge of habitat use and fission–fusion herd dynamics, we placed GPS […]
Age and socially related changes in fecal androgen metabolite concentrations in free-ranging male giraffes
In many mammal species, androgen levels in males are elevated during periods of mating activity, often to facilitate aggressive behavior between males over access to fertile females. However, this pattern might be less obvious in species with a rather low male-male aggression rate, or in those that are not strictly seasonal breeders. A complex social […]