Curlew Sandpiper (Calidris ferruginea) Science Article 2 abstract In several wader species that breed in the High Arctic, birds appear in pairs immediately after arrival at their breeding grounds (see references in Meltofte, 1985). It is generallyunknown, however, whether pairs were formed shortly after arrival at the breeding site or if the birds paired somewhere […]
Variations in plumage of male and female Pipra aureola
Crimson-hooded Manakin (Pipra aureola) Science Article 1 abstract Snow (Zoologica, 47: 195, 1962) states that female Golden-headed Manakins (Pipra erythrocephala) on Trinidad, West Indies, regularly have a few feathers characteristic of the male in the plumage of the head and body, and that, in birds trapped more than once,the number and distribution of these feathers […]
Distribution, variation, and taxonomy of Topaza hummingbirds (aves: trochilidae)
Crimson Topaz (Topaza pella) Science Article 1 abstract We review the distribution, variation, and taxonomy of the Crimson Topaz (Topaza pella) and theFiery Topaz (Topaza pyra). Both taxa show sexual dimorphism of foot color and notable age-related variationin plumage. Topaza pyra shows distinct and reliable differences from T. pella and warrants specific status.We describe a […]
Site condition monitoring of the breeding aggregation of crested tits (Parus cristatus) on the North Rothiemurchus Pinewood Site of Special Scientific Interest.
Crested Tit (Lophophanes cristatus) Science Article 1 abstract The North Rothiemurchus Pinewood SSSI includes the breeding aggregation of crested tits as one of itsdesignation criteria. BTO Scotland was commissioned by SNH to undertake a survey of crested tits withinthe designated area in March 2005 for site condition monitoring (SCM) reporting. A second objective wasto provide […]
Nest-building by crested tit Parus cristatus males:an analysis of costs and benefits
Crested Tit (Lophophanes cristatus) Science Article 2 abstract In a population of crested tits in Belgium, one out of three breeding males participated in nest-building. Since variation in the amount of nest-building among 11 building males was low, analysis of male nest-building allowed a logistic regression design. The probability of building increased with male condition […]
Nest site selection of the Eurasian Crane Grus grus in Estonia: an analysis of nest record cards
Crane (Grus grus) Science Article 3 abstract We describe in detail the nesting habitats of the Eurasian Crane in Estonia and explore relationships between different habitat characteristics and nesting success.We analysed all 161 reported Eurasian Crane nest finds in Estonia.We found that the cranes favorite nesting habitats are different types of mire (71%of all nests), […]
Daily activity and intake rate patterns of wintering Common Cranes
Crane (Grus grus) Science Article 2 abstract Daily activity patterns of wintering Common Cranes Grus grus were studied at Gallocanta, NE Spain, and related with changes in foraging site, distance to roost and flocking behavior. Per cent time spent feeding, feeding bout length, and food intake rate showed two peaks, in early morning and late […]
Verhalten von Kranichfamilien (Grus grus) in BrutrevierenNordostdeutschlands: Investition der Altviigel in ihre Nachkommen
Crane (Grus grus) Science Article 1 abstract Juveniles and immature birds normally have less foraging ability and a lower food intake rate than adults. This-it has been presumed-is compensated for by parental care and investment during juvenile development. Studies of time budgets and parental investment of Common Cranes were carried out in the years 1995 […]
Nesting of the Crane Hawk in Surinam.
Crane Hawk (Geranospiza caerulescens) Science Article 1 abstract Crane Hawk (Gevanosfiza caerulescens) in_ habits the mangrove forests along the coast of Surinam. It is found near water in light forests and in cultivated areas about the coffee plantations. Very little is known of its breeding habits and the only description of its nest and eggs […]
Reproduction of the Crag Martin (Ptyonoprogne rupestris) in relation to weather and colony size
Crag Martin (Ptyonoprogne rupestris) Science Article 1 abstract From 1994 to 1999, we investigated how climatic conditions influence the laying dates and number of fledged young of the Crag Martin Ptyonoprogne rupestris, a poorly studied colonial martin that, like other aerial feeding birds, is supposed to be highly dependent on weather conditions. Laying dates were […]