Burnished-buff Tanager (Tangara cayana) Science Article 1 abstract The objective of this study was to investigate feather mites on birds of the Family Emberizidae, tocollect data on the ecological ectoparasite-host relationship and infestation level. A sum of 94 birds of 9 specieswas captured at the Refugio Ecologico Charles Darwin, Igarassu, Pernambuco, Brazil, from August 1996 […]
Olfactory foraging strategies of procellariiform seabirds
Bulwers Petrel (Bulweria bulwerii) Science Article 1 abstract The study of olfactory foraging ability in procellariiform seabirds is now beginning to explore how species aremorphologically and behaviorally adapted to track odor plumes, and to relate these findings to models of odor transport innatural situations. According to the models, odors in atmospheric flow tend to be […]
Bullfinch Pyrrhula pyrrhula breeding ecology in lowland farmland and woodland: comparisons across time and habitat
Bullfinch (Pyrrhula pyrrhula) Science Article 2 abstract Bullfinch Pyrrhula pyrrhula populations decreased by 33% in Britain over the years 1977-82, the period of steepest decline. The timing of this decline and its greater severity on farmland (-65%) than in woodland (-28%) point to agricultural intensification as a likely environmental cause, but previous analyses of survival […]
Flock composition, agonistic behaviour and body condition of wintering Bullfinches Pyrrhula pyrrhula
Bullfinch (Pyrrhula pyrrhula) Science Article 1 abstract During October-April of 1989-2003 Imade observations on size and sexual composition of Bullfinch Pyrrhula pyrrhula flocks (ringed and unringed birds), recorded interactions betweenmembers and estimated the body condition of birds observed in amixed forest in central Norway. The flock size did not change with ambient temperature and ranged […]
Nesting of the Buff-throated Woodcreeper (Xiphorhynchus guttatus)
Buff-throated Woodcreeper (Xiphorhynchus guttatus) Science Article 1 abstract The Buff-throated Woodcreeper (Xiphorhynchugsu ttatus) is about 22 cm long and clad in the browns and buffs widespread in its family. The sexes are alike. From Guatemala to Bolivia, Amazonian and southeastern Brazil, it inhabits rain forests, humid gallery forests in more arid regions, and mangroves. It […]
Buff-throated Saltator eats army ants
Buff-throated Saltator (Saltator maximus) Science Article 1 abstract The relationship between army ants and birds in Neotropical forests has been studied carefully by Willis and others (see Willis and Oniki 1978, and included references). The birds that attend the ant swarms forage upon the invertebrates and small vertebrates that flee the ants (Willis and Oniki […]
THE NESTING OF SOME VENEZUELAN BIRDS
Buff-breasted Wren (Thryothorus leucotis) Science Article 4 abstract I passed the interval from 15 March to 24 July 1966 at ‘La Araguata,’ a large cattle farmsituated among the hills near Pirapira, some 20 miles south of Valencia in the state ofCarabobo, Venezuela. Although most of my time was devoted to the study of the RufousfrontedThornbird […]
FIRST RECORD OF COOPERATIVE BREEDING IN ATHRYOTHORUS WREN
Buff-breasted Wren (Thryothorus leucotis) Science Article 3 abstract Although offspring delay dispersal past the age of independence in many Thryothorus species,cooperative breeding has not been recorded in this genus. Here, I present the first observation of cooperativebreeding in a Thryothorus wren (Buff-breasted Wren, T. leucotis). Of 41 offspring that delayed dispersal pastthe age of independence, […]
Context matters: female aggression andtestosterone in a year-round territorialneotropical songbird (Thryothorus leucotis)
Buff-breasted Wren (Thryothorus leucotis) Science Article 2 abstract Testosterone promotes aggressive behaviour in male vertebrates during the breeding season, but theimportance of testosterone in female aggression remains unclear. Testosterone has both beneficial anddetrimental effects on behaviour and physiology, prompting the hypothesis that selection favours anassociation between aggression and testosterone only in certain contexts in which […]
Timing and duration of egg laying in duettingBuff-breasted Wrens
Buff-breasted Wren (Thryothorus leucotis) Science Article 1 abstract Using direct observations of Buff-breasted Wrens (Thryothorus leucotis), I examined timing andduration of egg laying, the behavior of females and males around the time of laying, and duetting and solo singingon laying and non-laying mornings. When laying, females roosted either alone in breeding nests or with their […]