Results 251 to 260 of about 982,511 (289)

Prey selection by plovers: Optimal foraging in mixed-species groups

Animal Behaviour, 1984
Abstract Prey (earthworm) size selection was investigated in lapwings ( Vanellus vanellus ) and golden plovers ( Pluvialis apricaria ) feeding in mixed species flocks and compared with that predicted by an optimal foraging model based on energy intake.
D.B.A. Thompson, C.J. Barnard
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Behavioral Flexibility of Pine Siskins in Mixed Species Foraging Groups

The Condor, 1979
They [the Pine Siskins] were exceedingly fond of sunflower seeds, but their bills were so tender that they were hardly able to crack the hard shells so as to obtain the kernel inside. So they would watch their opportunity, and whenever an Evening Grosbeak came to the feeding-shelf and began cracking the seeds, he would be surrounded by several of the ...
Balph, David F., Balph, Martha Hatch
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A mechanism mediating inter-individual associations in mixed-species groups

Behavioral Ecology and Sociobiology, 2016
Individuals within groups benefit when they are phenotypically and behaviourally similar. Despite this, mixed-species aggregations are found among a wide range of animal taxa and are known to provide advantages in terms of enhanced foraging efficiency and predator avoidance.
Tanja K. Kleinhappel, Oliver H. P. Burman, Elizabeth A. John, Anna Wilkinson, Thomas W. Pike   +4 more
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Mixed-species primate groups in the kibale forest: Ecological constraints on association

International Journal of Primatology, 1996
Five species of diurnal primates in the Kibale Forest of western Uganda— red colobus (Colobus badius),black- and- white colobus (Colobus guereza),redtail monkeys (Cercopithecus ascanius),blue monkeys (Cercopithecus mitis),mangabeys (Cercocebus albigena)-often associate in mixed- species groups that vary in size and composition from day to day.
Colin A. Chapman, Lauren J. Chapman
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Effects of Mixed-species Foraging Groups on the Feeding and Aggression of Juvenile Parrotfishes

Environmental Biology of Fishes, 2000
Many parrotfishes (Scaridae) co-occur in mixed-species aggregations as juveniles, but diverge in resource use and social structure as adults. Focal observations of three juvenile parrotfishes (Scarus coeruleus, Sparisoma aurofrenatum, and Sparisoma viride) were conducted on inshore patch reefs in the Florida Keys to determine how feeding and aggressive
Karen L. Overholtzer, Philip J. Motta
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Tamarin Mixed-Species Groups: An Evaluation of a Combined Captive and Field Approach

Folia Primatologica, 1997
The geographical distributions of the tamarins Saguinus mystax, S. imperator and S. lahiatus do not overlap, but each of these species is sympatric with S. fuscicollis, and mixed-species associations are formed. One way to examine the costs and benefits of association is to compare mixed-species tamarin groups and single-species tamarin groups in the ...
Hannah M. Buchanan-Smith, Scott M. Hardie   +1 more
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Social dynamics of mixed-species groups of Jamaican reef fishes

Behavioral Ecology and Sociobiology, 1977
1. Observation of coral reef fish in Jamaica revealed a continuous and erratic series of fluctuations in both individual and species group size. 2. No apparent trend existed between group size or species composition with any subsequent changes in the group.
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Mixed-species grouping in Thomson's and Grant's gazelles: the antipredator benefits

Animal Behaviour, 1990
Abstract Thomson's gazelles, Gazella thomsoni , and Grant's gazelles, G. granti , in the Serengeti National Park, Tanzania, frequently associate in mixed-species groups. Males are more likely to associate than females. Here the antipredator benefits of such associations are investigated.
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Odd fish abandon mixed-species groups when threatened

Behavioral Ecology and Sociobiology, 1985
In a field experiment, two juvenile size classes of striped parrotfish (Scarus iserti), stoplight light parrotfish (Sparisoma viride), and ocean surgeonfish (Acanthurus bahianus) were threatened by a model of a common predator (the trumpetfish, Aulostomus maculatus) while alone and in mixedspecies groups of 3–100 members.
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Consequences of Joint-Territoriality in a Mixed-Species Group of Tamarin Monkeys

Behaviour, 1992
AbstractGroups of saddle-back (Saguinus fuscicollis) as moustached tamarins (Saguinus mystax) in a western Amazonian forest jointly defended home ranges larger than 100 ha, which were held in common throughout the year. Resources were defended by direct exploitation in extensive areas shared with other groups, or through intensive and frequent ...
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