Twite (Carduelis flavirostris) Science Article 2 abstract The Twite Carduelis flavirostris is classified as a red-listed bird of conservation concern in the United Kingdom. Successful conservation initiatives will depend on an understanding of local movement patterns and natal philopatry as these will be important in determining how likely the species is to colonise new nesting […]
Category: Passeriformes
Occurrence of Collyriclum taba (Trematoda) in a Varied Thrush with a note on a single bird’s internal parasites
Varied Thrush (Ixoreus naevius) Science Article 3 abstract parasites.–A Varied Thrush (Ixoreus naevlus) was obtained on 18 November 1960, near Woods Creek, Benton County, Oregon. The bird was infected with 14 mature Collyriclum faba. The flukes were in pairs, in subcutaneous cysts adjacent to the anus. The paired flukes were not equal in size. ALBERT […]
AN ORANGELESS MUTANT OF THE VARIED THRUSH AND ITS BEARING ON SEX COLOR-DIFFERENCES
Varied Thrush (Ixoreus naevius) Science Article 2 abstract From a study of a partially albino female Varied Thrush, certain inferences are suggested with regard to sex coloration, principal of which is that, in Ixoreus, the sex difference in pigmentation is quantitative rather than qualitative. J. EUGENE LAW, THE CONDOR Vol. 23, 1931 Download article download […]
CAUSES AND CONSEQUENCES OF TREE SWALLOW(TACHYCINETA BICOLOR) DISPERSAL IN SASKATCHEWAN
Tree Swallow (Tachycineta bicolor) Science Article 12 abstract Poor breeding success often increases dispersal, but there is conflicting evidenceabout the putative adaptive benefi ts of dispersal behavior. Thus, observational and experimentaldata were analyzed to test whether breeding success (number of young fl edging) infl uencedbreeding and natal dispersal by Tree Swallows (Tachycineta bicolor), using information […]
Observations on the nesting and incubation behavior of the Tropical Gnatcatcher (Polioptila plumbea)
Tropical Gnatcatcher (Polioptila plumbea) Science Article 1 abstract OBSERVATIONS ON INCUBATION AND NESTING BEHAVIOR OF THE TROPICAL GNATCATCHER (POLIOPTILA PLUMBEA) IN EASTERN ECUADOR Erin C. Hannelly & Harold F. Greeney, Ornitologia Neotropical 15: 539-542 Download article download full text (pdf)
TIME AND ENERGY BUDGETS OF THE MOCKINGBIRD (MIMUS POLYGLOTTOS) DURING THE BREEDING SEASON
Tropical Mockingbird (Mimus gilvus) Science Article 2 abstract A time and energy budget of male and female Mockingbirds (Mimus polyglottos) in six phases of their breeding cycle was completed using the equivalent temperature model to predict perching metabolic rates. Recorded time-budget behaviors included perching, bipedal locomotion, flight, and the time spent in the sun and […]
Bigamy in a Male Mockingbird
Tropical Mockingbird (Mimus gilvus) Science Article 1 abstract Like many passerine species, the Mockingbird (Mimus polyglottos) is thought to be highly monogamous. Laskey (1935, Auk 52: 370), for example, reports perennial pair bonding between identified males and females, even though the female may leave for the fall and return to the same male during the […]
THE NESTING OF SOME VENEZUELAN BIRDS
Tropical Mockingbird (Mimus gilvus) Science Article 3 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 […]
New records concerning range and altitudinal distribution ofTropical Mockingbird Mimus gilvus in Ecuador
Tropical Mockingbird (Mimus gilvus) Science Article 4 abstract Se reportan dos nuevas localidades para el Sinsonte Colilargo Mimus gilvus en Ecuador. Junto aestos registros la especie es conocida por cuatro observaciones en el pais, todas ubicadas en losAndes del norte de Ecuador. Se sugiere que Mimus gilvus puede estar extendiendo su rango dedistribucion desde Colombia, […]
MICROBES IN TREE SWALLOW SEMEN
Tree Swallow (Tachycineta bicolor) Science Article 15 abstract A frequently hypothesized but poorly studied cost of multiple mating in birds is thatexposure to pathogenic sexually transmitted microbes (STM’s) can lower reproductive success.Conversely, female birds may benefit from high frequencies of copulation and multiple copulationpartners if they receive cloacal inoculations of beneficial STM’s that can either […]