Category: science article

Breeding habitat use by sympatric and allopatric populations of Wilson’s Warblers and Yellow Warblers

Yellow Warbler (Dendroica petechia) Science Article 15 abstract We studied Wilson’s Warbler (Wilsonia pusilla) and Yellow Warbler (Dendroica petechia) habitat use in allopatric and sympatric populations in the Rocky Mountains of northern Colorado and southeastern Wyoming in order to better understand the different habitat needs and interactions of these two species. Janet M. Ruth and […]

yellow warbler (dendroica petechia) breeding biology and parasitism by the shiny cowbird (molothrus bonariensis) inboqueron, puerto rico

Yellow Warbler (Dendroica petechia) Science Article 6 abstract Aspects of the breeding biology of the Yellow Warbler (Dendroica petechia) and ShinyCowbird (Molothrus bonariensis) parasitism were studied in Boqueron, Puerto Rico from 2001 to 2002.Fifty-seven percent (n = 12) of warbler nests were parasitized. Survival of parasitized nests was lowerthan non-parasitized nests. Thirty-four percent of nests […]

Adoption of yellow warbler nestlings by song sparrows

Yellow Warbler (Dendroica petechia) Science Article 3 abstract Although interspecific brood adoption has been reported in several species of birds, theprocess by which it occurs has seldom been reported. We observed a pair of Song Sparrows (Melospiza melodia) that adopted a brood of Yellow Warblers (Dendroica petechia) and, gradually, over several days, took over the […]

Cuckoldry and lack of parentage-dependent paternal care in yellow warblers:a cost-benefit approach

Yellow Warbler (Dendroica petechia) Science Article 10 abstract Theory suggests that a male strategy of reducing parental care in response to reducedparentage should evolve only under certain conditions. Expected paternity in subsequent matings ispredicted to be primary in effect, because it determines whether there is a future benefit to compensatemales for the cost of reduced […]

parental feeding of nestling yellow warblers in relation to brood size and prey availability

Yellow Warbler (Dendroica petechia) Science Article 12 abstract The feeding by adult Yellow Warblers (Dendroicap etechia) of nestlings in broods of 3, 4, or 5 young was studied during two breeding seasons on the forested dune ridge near Delta, Manitoba. Broods of 2-day-old young were selectively fed geometrid larvae by the adults, and broods of […]

Subspecific Identification of the Willet Catoptrophorus semipalmatus

Willet (Catoptrophorus semipalmatus) Science Article 3 abstract The Willet is a familiar shorebird to many birders around temperate regions of North, Central, and South America. Its large size, drab plumage, and flashy wing pattern make it relatively straightforward to identify Michael O’Brien, BIRDING MAY/JUNE 2 0 0 6 Download article download full text (pdf)

Predator avoidance behaviour of a solitary Willet attacked by a Peregrine Falcon

Willet (Catoptrophorus semipalmatus) Science Article 2 abstract During the non-breeding season, Willets Catoptrophorus semipalmatus use a variety of tactics to avoid predators and have been reported to take flight, submerge themselves inwater, and hide in or near marsh vegetation JOSEPH B. BUCHANAN, Bulletin 104 August 2004 Download article download full text (pdf)

Social Organization In A Nesting Population Of Eastern Willets (Catoptrophorus Semipalmatus)

Willet (Catoptrophorus semipalmatus) Science Article 1 abstract The breeding ecology of eastern Willets (Catoptrophorus semipalmatus) was studied over a 3-yr period in a salt marsh on the Atlantic coast of Virginia. During the study,171 adults were color-marked MARSHALL A. HOWE, The Auk 99: 88-102. January 1982 Download article download full text (pdf)

Seasonal variation in bill morphology of Nuthatches Sitta europaea dietary adaptations or consequences?

Wood Nuthatch (Sitta europaea) Science Article 3 abstract Bills of juvenile Nuthatches continue to increase in size (length and depth) for up to three months after fledging. Bills of individual full-grown birds increase in length from April to October with a temporary drop in June, and decrease throughout the winter season. Bill depth increases from […]