Common Nighthawk (Chordeiles minor) Science Article 4 abstract the time of Oberholser’s revision of the subspecies of Chordeiles minor in 1914 (Bull. U. S. Nat. Mus., 86), the southernmost known limits of the continental breeding range of this species were based on a specimen of henyri from Babfcora, central-western Chihuahua, collected on June 21, 1902, […]
Notes on breeding of the Common Nighthawk in Panama.
Common Nighthawk (Chordeiles minor) Science Article 1 abstract The taking in Panama on 7 May 1961 of a Common Nighthawk (Chordeiles minor), which wasbrooding a single downy young, established that this species, essentially one of temperate North America, breeds far south into the tropics, where it had generally been regarded as a migrant only. L. […]
OBSERVATIONS ON THE INCUBATION BEHAVIOR OF A COMMON NIGHTHAWK
Common Nighthawk (Chordeiles minor) Science Article 2 abstract Although the Common Nighthawk (Chordeiles minor) has been studied extensively, certain phases of its breeding biology have been considered only superficially. Among these are the incubation movements of the female, the manner in which eggs are moved, and certain activities of the male. An opportunity to investigate […]
aerial rain bathing by Common Nighthawks.
Common Nighthawk (Chordeiles minor) Science Article 3 abstract Both Slessers (Auk 87:91-99, 1970) and Simmons (pp. 101-104 in A Dictionary of Birds, B. Campbell and E. Lack, eds., Buteo Books, Vermillion, South Dakota, 1985) classified methods of bathing in water by birds, but neither mentioned a method we observed in the Common Nighthawk (Chordeifes minor), […]
When do helpers help ? Food availability and helping in the moorhen, Gallinula chloropus
Common Gallinule (Gallinula chloropus) Science Article 3 abstract The importance of food availability as a constraint upon cooperative behaviour was ex amined by providing supplementary food on some breeding territories of a population of moorhens (Gallinula chloropus). First brood juveniles on territories provided with food were more likely to feed their younger second brood siblings. […]
Parent-offspring aggression in moorhens
Common Gallinule (Gallinula chloropus) Science Article 2 abstract The purpose of this study was to explain parental aggression to offspring in the moorhen (Gallinula chloropus). Males and females did not feed different subsets of chicks. In addition, there was a positive correlation between feeding rates of each parent to a particular chick and the number […]
Small, fat male moorhens Gallinula chloropus are healthier
Common Gallinule (Gallinula chloropus) Science Article 4 abstract Analysing the variation in time along the autumn and winter of the extent of the fat reserves of adult male moorhens. In the period preceding pair formation (February 2003), the relationship was obtained between body size (represented by tarsus length) and an effective index of fat reserves […]
Brood parasitism and cooperative nestingin the moorhen, Gallinula chloropus
Common Gallinule (Gallinula chloropus) Science Article 1 abstract During a two year study of the moorhen, Gallinula chloropus, a quarter of the nests found had two or more females laying in them. This was the result of two features of the moorhens’ breeding biology: (1) Cooperative nesting; two (or more) females were paired to the […]
Broedende Vuurgoudhanen Regulus ignicapillus in Nederland: hoe het verder ging
Common Firecrest (Regulus ignicapilla) Science Article 1 abstract Het broeden van Vuurgoudhanen in Nederland bleef lang in nevelen gehuld. Dit is ook niet zo vreemd aangezien het om een van de kleinste Nederlandse vogels gaat, zich veelal hoog in donkere sparrenbomen ophoudend en begiftigd met slechts een bescheiden vocaal vermogen. In een tijd waarin vogelaars […]
Numerical response of common buzzards and predation rate of main and alternative prey under fluctuating food conditions.
Common Buzzard (Buteo buteo) Science Article 2 abstract We studied the numerical response of a population of the common buzzard Buteo buteo to the fluctuations of its main prey (voles) and alternative prey (forest grouse) in western Finland between 1979 and 1996. Populations of main prey fluctuated in a cyclic manner with three years between […]