Journal ArticleDOI
Sleeping and vigilance in birds, II. An experimental study of the Barbary dove (Streptopelia risoria)
TLDR
Individual vigilance fell with increasing flock size, and was higher in high-risk birds, however, corporate vigilance increased with flock size; high- risk flocks were more vigilant than low-risk flocks.About:
This article is published in Animal Behaviour.The article was published on 1984-02-01. It has received 114 citations till now. The article focuses on the topics: Flock & Vigilance (behavioural ecology).read more
Citations
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Journal ArticleDOI
Animal sleep: A review of sleep duration across phylogeny
TL;DR: The present paper examines the literature concerning sleep duration in over 150 animal species, including invertebrates, fish, amphibians, reptiles, birds, and 14 orders of mammals, to evaluate these variables in a wide range of animal species.
Journal ArticleDOI
Vigilance for predators: detection and dilution effects
TL;DR: The security model demonstrates that both detection and dilution are important in determining the frequency of vigilance behaviour but that the relative importance of these two effects changes across group size, with detection providing relatively less benefit as group size increases.
Journal ArticleDOI
Theory and method in studies of vigilance and aggregation.
TL;DR: The relationship of vigilance to aggregation is not straightforward and the absence of a group-size effect on vigilance among primates is probably due to functional differences in vigilance behaviour or safety in groups, not to methodological differences.
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Evolving concepts of sleep cycle generation: From brain centers to neuronal populations
TL;DR: The electrophysiological evidence concerning the REM-on and REM-off cell groups suggests a gradient of sleep-dependent membrane excitability changes that may be a function of the connectivity strength within an anatomically distributed neuronal network.
Journal ArticleDOI
Sleeping under the risk of predation
TL;DR: It is argued that whole-brain or ‘blackout’ sleep may be the safest way to sleep given a functionally interconnected brain, and a conceptual model of sleep architecture is outlined in which dynamic changes in sleep states reflect a trade-off between the benefits of reducing a sleep debt and the cost of predation.
References
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Journal ArticleDOI
Vigilance and group size in ostriches
TL;DR: In this paper, the authors observed wild ostriches while feeding alone or in groups of up to four birds, and their vigilance (proportion of time with the head up) recorded.
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Flock feeding and time budgets in the house sparrow (Passer domesticus L.)
TL;DR: The risk of predation was apparently higher in the fields where birds scanned more frequently than in the cattlesheds and where scanning was negatively influenced by flock size but positively influenced by distance from cover.
Journal ArticleDOI
Avian flocking in the presence of a predator
TL;DR: A trained hawk was flown over flocks of granivorous yellow-eyed juncos to compare time budgets in the presence and absence of a predator, and it was found that time budgets changed after the predator was introduced and also that flock size increased in the absence of the predator.
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