Fox Sparrow (Passerella iliaca) Science Article 2 abstract The study of the song of the fox sparrow is a highly tantalizing pursuit owing to the bird’s brief stay, provoking habits of silence and reluctance to sing in full voice. THEODORE CLARKE SMITH, The Ohio Naturalist Vol. 3, No. 6 Download article download full text (pdf)
Category: Passeriformes
Changes in body condition from spring migration to reproduction in the Garden Warbler Sylvia borin : a comparison of a lowland and a mountain population
Garden Warbler (Sylvia borin) Science Article 1 abstract Long-distance migrants often arrive on their breeding grounds with large fat stores . Two expl anations for this phenomenon are (1) that large fat stores at arrival are needed to speed up the breeding schedule and to counteract possible time constraints, and (2) that they are used […]
THE SUBSPECIES OF HESPERIPHONA VESPERTINA
Evening Grosbeak (Hesperiphona vespertina) Science Article 1 abstract The writer’s attention was first called to the systematic status of the Evening Grosbeaks of western North America by Mr. Allan Brooks who stated in a letter that he had found certain peculiarities in his series gathered in British Columbia. JOSEPH GRINNELL, THE CONDOR Vol. 19, 1917 […]
WINTER SURVEY DATA REVEAL RANGEWIDE DECLINE IN EVENINGGROSBEAK POPULATIONS
Evening Grosbeak (Hesperiphona vespertina) Science Article 3 abstract Once one of the most common species seen at bird feeding stations across much of North America in winter, the Evening Grosbeak (Coccothraustes vespertinus), appears to be experiencing a population decline. Like other finches associatedwith the boreal forest or high elevations, Evening Grosbeaks form flocks in winter, […]
Juvenal plumage of the Evening Grosbeak
Evening Grosbeak (Hesperiphona vespertina) Science Article 2 abstract All the authorities that have dealt with the plumages of the Evening Grosbeak have described the juveniles of both sexes as resembling the adult female. Allan Brooks, The AUK vol. 56, 1939 Download article download full text (pdf)
Fluctuations related to rainfall in richness and abundance of birds of steppic Mediterranean habitats
Fan-tailed Warbler (Cisticola juncidis) Science Article 1 abstract The existence of interannual variations in the richness and abundance of bird species breeding in pseudo-steppic Mediterranean areas is analysed and related to the important fluctuations that take place in rainfall, which in turn deeply influence vegetation growth. The hypothesis of food limitation as a key factor […]
Nest defence strategies in the Fieldfare Turdus pilaris: the responses on an avian and a mammalian predator.
Fieldfare (Turdus pilaris) Science Article 1 abstract The Fieldfare Turdus pilaris, a medium-sized passerine, is aggressive in nest defence and its use of f ces may be detrimental to avian but not to mammalian predators. The birds breed either solitarily or in colonies, the nesting pattern in subalpine forests is apparently dependent on the abundance […]
Colonial and single breeding in fieldfares, Turdus pilaris L.:a comparison of nesting success in early and late broods
Fieldfare (Turdus pilaris) Science Article 2 abstract Pairs of fieldfares breed singly or in colonies. Their breeding season was subdivided into an early part, when the trees were still leafless, and a late part, when the trees had leaves. Early colonial pairs had a significantly higher nesting success than single pairs. However, amongst late broods […]
Unusual bathing behavior of the Fork-tailed Flycatcher in Colombia
Fork-tailed Flycatcher (Tyrannus savana) Science Article 1 abstract While conducting a crocodile (Crocorlylus sp.) census along the Tomo River, Vichada, Colombia, I observed Fork-tailed Flycatchers (Tyrarznus savana) engaged in unusual group behavior. Six birds were perched 10 m up in a dead tree at water’s edge on the south bank of the river. The birds […]
GEOGRAPHIC VARIATION IN ONTOGENY OF THE FOX SPARROW
Fox Sparrow (Passerella iliaca) Science Article 3 abstract Ontogeny of two morphologically differentiated populations of Fox Sparrows (PassereNail iaca) was compared to reveal the developmental bases of adult morphologicaldifferences. Growth of tarsus, wing, bill, and tail length relative to body mass was compared between the two populations to determine if geographic variation in adults results […]