Rough-legged Hawk (Buteo lagopus) Science Article 1 abstract Visceral gout is reported for the first time in a rough legged hawk (Buteo Iagopus). Urate crystals were present on the pencardium, thoracic and abdominal air sacs, and the ventral surface of the liver. The liver and spleen also had urate crystals throughout the parenchyma. There was […]
A Second Breeding Site for Ross’s Gull (Rhodostethia rosea) in Nunavut, Canada
Rosss Gull (Rhodostethia rosea) Science Article 1 abstract Only 15 cases of breeding of Ross’s gull Rhodostethia rosea are known outside of Siberia. While numerous birdsare regularly seen in the fall at Point Barrow, Alaska, until now only one breeding locality has been known for Nunavut, Canada.We found a second breeding locality in Nunavut in […]
Sexing and ageing Rose-ringed Parakeets Psittacula krameri in Britain
Rose-ringed Parakeet (Psittacula krameri) Science Article 1 abstract Although Rose-ringed Parakeets Psittacula krameri over three years old can easily be sexed due to the males’ rose-coloured neck-rings and black bibs, sexually immature males and females are considered impossible to separate in the hand. The biometrics of males and females overlap but males tend to be […]
Mate choice is not important for female reproductive success in the common Rosefinch (Carpodacus erythrinus)
Rosefinch (Carpodacus erythrinus) Science Article 1 abstract I studied mate choice in relation to female reproductive success in the Common Rosefinch( Carpodacuesr ythrinuso) over a four-year period. Approximately 50-99% of the variance in female reproductive success was due to nest predation during incubation. Because males did not defend nest sites and females probably face time […]
Biometrics and sex identification of the Rose-Coloured Starling Sturnus roseus
Rose-coloured Starling (Pastor roseus) Science Article 1 abstract Biometric and plumage data on breeding Rose-coloured Starlings Sturnus roseus showed that the species is partially sexually dimorphic in size and plumage colour. Both sexes develop a brood patch, although it is most frequently found in females. Although males are generally more intensely coloured than females, there […]
Malformed Bill of Rose-breasted Grosbeak
Rose-breasted Grosbeak (Pheucticus ludovicianus) Science Article 1 abstract On September 4, 1904, a boy brought to me an adult female Rose-breasted Grosbeak (Zamelodialudoviciana), the bill of which presented a curious realformation. Careful examination shows that the condition was not caused by injury, as there is no trace whatever of a fracture, and the upper mandible […]
Activity patterns and effect of ticks on growth and survival of tropical roseate tern nestlings
Roseate Tern (Sterna dougallii) Science Article 1 abstract Patterns of abundance of the seabird tick Amblyomma loculosum and their effectson Roseate Tern (Sterna dougallii) nestling growth, fledging age, and survival are describedon Aride Island, Seychelles, in 1997-1999. Female ticks attached to nestlings from 4to 14 days (to engorge) whereas male ticks attached for 1-3 days. […]
Foraging Habitat and Chick Diets of Roseate Tern, Sterna dougallii, Breeding on Country Island, Nova Scotia
Roseate Tern (Sterna dougallii) Science Article 2 abstract Breeding seabirds are threatened by human activities that affect nesting and foraging habitat.In Canada, one of the seabirds most at risk of extirpation is the Roseate Tern, Sterna dougallii. Althoughcritical nesting habitat has been identified for the Roseate Tern in Canada, its foraging locations and thediet of […]
The known history and movements of the Roseate Tern Sterna dougallii in South Africa and the western Indian Ocean
Roseate Tern (Sterna dougallii) Science Article 3 abstract The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate Tern The Roseate […]
NESTING ECOLOGY OF ROSEATE SPOONBILLS AT NUECES BAY, TEXAS
Roseate Spoonbill (Ajaia ajaja) Science Article 1 abstract We conducted a study in 1978-1980 of the nesting colony of Roseate Spoonbills (Ajaia ajaja) in a relatively polluted environment at Nueces Bay, Texas. For 154 marked nests, the average clutch size was 3.0 eggs; 73% of the eggs hatched, and 87% of the nests were successful […]