Intensity of giraffe locomotor activity is shaped by solar and lunar zeitgebers
Natural cycles of light and darkness shift the balance of risks and gains for animals across space and time. Entrainment to photic cycles allows animals to spatiotemporally adapt their behavioural and physiological processes in line with interplaying ecological factors, such as temperature, foraging efficiency and predation risk. Until recently, our understanding of these chronobiological processes […]
Beast Buddies – Do Animals Have Friends?
That issue of preferred associates comes close to the human notion of friendship, and it can prove just as important in understanding animal goings-on as it does in people watching. Baboons, bats, and dozens of other animals have been studied from this perspective. Biologists may start by asking whether individuals prefer to hang out with […]
Use of Datura innoxia by ungulates in the Hoanib River, Namibia
The behaviour of springbok Antidorcas marsupialis feeding on the alien invasive plant Datura innoxia is described, as well as nervous symptoms possibly arising from tropane alkaloid poisoning. Dung collected from five herbivore species prior to 1989 contained no D. innoxia seeds, and other signs of use of it were rare. Feeding on this plant, principally […]
Outlines of wildlife conservation in Angola
A review of the history and present status of wildlife conservation in the Portuguese west African state of Angola is presented. The geomorphology, geology, climate and major biogeographic divisions are briefly described and the history of wildlife legislation and administration reviewed. The present status of existing conservation areas, wildlife utilization, threatened ecosystems and rare species […]
Evolutionary Ecology of Giraffes (Giraffa camelopardalis) in Etosha National Park, Namibia
The giraffe (Giraffa camelopardalis) occupies a variety of habitats across sub-Saharan Africa. It is characterised by a loose social organisation, and a dominance driven polygynous mating system. This project sought to explain biogeographic and inter-sexual variation in pelage colouration in the context of natural and sexual selection. I also sought to test the hypothesis that […]
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 […]
Nightly selection of resting sites and group behavior reveal antipredator strategies in giraffe
This study presents the first findings on nocturnal behavior patterns of wild Angolan giraffe. We characterized their nocturnal behavior and analyzed the influence of ecological factors such as group size, season, and habitat use. Giraffe were observed using night vision systems and thermal imaging cameras on Okapuka Ranch, Namibia. A total of 77 giraffe were […]
Charting a course for giraffe conservation
Letter reporting on the July 2011 indaba at Etosha Safari Lodge, Namibia Giraffe: The Forgotten Megafauna convened by GCF.
Development of 11 microsatellite markers for Giraffa camelopardalis through 454 pyrosequencing, with primer options for an additional 458 microsatellites
Many wild giraffe populations are declining across Africa, with two subspecies listed by the IUCN as Endangered in the past 4 years. We developed 11 microsatellite markers from Giraffa camelopardalis angolensis in Etosha National Park, Namibia using 454 sequencing. In 70 individuals, the loci showed 2–4 alleles per locus and expected heterozygosities of 0.082–0.711. There were […]
Grazing behaviour of the giraffe in Hwange National Park, Zimbabwe
The giraffe (Giraffa camelopardalis) is usually described as an exclusive browser, feeding only on shrubs and trees, preferably between 2 and 5 m above ground (Lamprey, 1963; McNaughton & Georgiadis, 1986; Ciofolo & Le Pendu, 2002). Although browsing seems to be an easier form of feeding for giraffes in terms of accessibility and vigilance (Young […]