• Publications
  • Influence
The costs of keeping cool in a warming world: implications of high temperatures for foraging, thermoregulation and body condition of an arid-zone bird.
Recent mass mortalities of bats, birds and even humans highlight the substantial threats that rising global temperatures pose for endotherms. Although less dramatic, sublethal fitness costs of highExpand
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Cognitive performance is linked to group size and affects fitness in Australian magpies
The social intelligence hypothesis states that the demands of social life drive cognitive evolution. This idea receives support from comparative studies that link variation in group size or matingExpand
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Synchronous provisioning increases brood survival in cooperatively breeding pied babblers.
1. Behavioural synchrony typically involves trade-offs. In the context of foraging, for example, synchrony may be suboptimal when individuals have different energy requirements but yield net benefitsExpand
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Interrogating recent range changes in South African birds: confounding signals from land use and climate change present a challenge for attribution
Aim Apparent anthropogenic warming has been underway in South Africa for several decades, a period over which significant range shifts have been observed in some indigenous bird species. We askedExpand
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Facultative response to a kleptoparasite by the cooperatively breeding pied babbler
In many cases of interspecific kleptoparasitism, hosts develop defensive behaviors to minimize the impact of kleptoparasites. Because vigilance and defensive behaviors are often costly, selectionExpand
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The value of constant surveillance in a risky environment
In risky environments, where threats are unpredictable and the quality of information about threats is variable, all individuals face two fundamental challenges: balancing vigilance against otherExpand
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The cost of being alone: the fate of floaters in a population of cooperatively breeding pied babblers Turdoides bicolor
The occurrence of group-living behaviour has often been explained by the benefits individuals receive through cooperation; including increased reproductive output, vigilance against predators, andExpand
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Monogamous dominant pairs monopolize reproduction in the cooperatively breeding pied babbler
Understanding how reproduction is partitioned between group members is essential in explaining the apparent reproductive altruism of cooperatively breeding systems. Here, we use genetic data from aExpand
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The effects of temperature on offspring provisioning in a cooperative breeder
While most current predictive models agree that the climate is changing, it is not yet clear what impact these changes will have on animal populations. It is vital to determine the potentialExpand
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Invading together: the benefits of coalition dispersal in a cooperative bird
  • A. Ridley
  • Biology
  • Behavioral Ecology and Sociobiology
  • 2011
Dispersal attempts can be costly and may often end in failure. Individuals should therefore only disperse when the benefits of dispersal outweigh the costs. While previous research has focussed onExpand
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