Hearing sensitivity and critical ratios of hooded crows (Corvus corone cornix)

2006 ◽  
Vol 119 (2) ◽  
pp. 1269 ◽  
Author(s):  
Kenneth K. Jensen ◽  
Signe Klokker
Keyword(s):  
Hearing Sensitivity ◽  
Corvus Corone ◽  
Hooded Crows

Aggressive behaviour in Montagu’s harrier Circus pygargus during the courtship period

Biologia ◽  
2006 ◽  
Vol 61 (5) ◽  
Author(s):  
Jarosław Wiącek
Keyword(s):  
Aggressive Behaviour ◽  
Aggressive Interactions ◽  
Circus Pygargus ◽  
Circus Aeruginosus ◽  
Corvus Corone ◽  
Montagu’S Harrier ◽  
Asio Flammeus ◽  
Hooded Crows ◽  
First Time ◽  
Montagu's Harrier

AbstractAggressive behaviour of Montagu’s harrier was observed during the pre-laying period in the 1992–1995 seasons on the calcareous marshes of Chelm in Eastern Poland. In total, 435 flights performed by 24 pairs of individually marked harriers were analysed. All flights were performed in relation to the territory of defence. Males performed 61% of aggressive interactions while females performed 39%. Intraspecific and interspecific aggression comprising direct attacks (58%), escorts (13%), pursuits (28%) and “mirror behaviour” (1%) were described for the first time. Interspecific aggressive behaviour occurred only near territory boundaries. The main intruders were marsh harriers Circus aeruginosus breeding on the same marshes. Occasionally, harriers attacked curlews Numenius arquata, short-eared owls Asio flammeus, magpies Pica pica, hooded crows Corvus corone cornix, common buzzards Buteo buteo or hobbies Falco subbuteo. Four cases of communal mobbing were observed. Three to five males from the neighbourhood attacked the intruders together. Intraspecific aggressive behaviour was observed in the pair territory, near the boundary or at a distance of up to 100 m from the defended area. Aggressive interactions performed by both sexes were more frequent towards birds of the same sex. Females defended their territories more aggressively against females. Similarly, males were more aggressive against males. All cases of aggressive behaviour were observed near harrier territories. Aggressive relations between birds outside breeding territories or when foraging around marshes were not observed.

Food Caching, Cache Recovery, and the Use of an Egg Shell Dump in Hooded Crows Corvus corone cornix

1988 ◽  
Vol 19 (4) ◽  
pp. 268 ◽  
Author(s):  
Per E. Fjeld ◽  
Geir A. Sonerud
Keyword(s):  
Food Caching ◽  
Corvus Corone ◽  
Cache Recovery ◽  
Egg Shell ◽  
Hooded Crows

scholarly journals Nesting biology of the Hooded Crow Corvus corone cornix in a mixed residential–agricultural area in southern Sweden

Ornis Svecica ◽  
2010 ◽  
Vol 20 (2) ◽  
Author(s):  
Rebecca Hessel ◽  
Johan Elmberg
Keyword(s):  
Hatching Success ◽  
Canopy Cover ◽  
Forest Edge ◽  
Southern Sweden ◽  
Land Area ◽  
Nesting Biology ◽  
Significant Bias ◽  
Corvus Corone ◽  
Pine Trees ◽  
Hooded Crows

We studied 11 active and 29 old nests of Hooded Crows Corvus corone cornix in a mixed residential-farmland landscape (3.6 km2) in southern Sweden in 2009. The density of active nests was 3.06/km2 land area and 7.33/km2 forest area. Thirty-eight nests were in pine-dominated forest and two in private gardens. All nests (active and old) were in pine trees Pinus sylvestris, and sample plots around nest trees had the following characteristics (means): 350 tree stems/hectare, 1,487 bushes/ hectare, and canopy cover 8%. Distance to the nearest active Crow nest averaged 234 m, but variation was large. Mean distance from nests to nearest forest edge was 19 m and to the nearest inhabited building 68 m. Nests were placed near the tree top (mean height 11 m) in all cardinal directions but with a significant bias towards the south. Seven out of 11 (64%) active nests produced fledglings (mean 1.2 nestling/successful nest). Breeding success was higher in nests that were close to another crow nest. Compared with previous studies, hatching success was high but final fledgling production was low.

Geographic variation in size and sexual dimorphism across a hybrid zone between Carrion Crows (Corvus corone corone) and Hooded Crows (C. c. cornix)

1994 ◽  
Vol 72 (9) ◽  
pp. 1543-1550 ◽  
Author(s):  
Nicola Saino ◽  
Fiorenza De Bernardi
Keyword(s):  
Hybrid Zone ◽  
Sexual Size Dimorphism ◽  
Function Analysis ◽  
Absolute Difference ◽  
Ecological Gradient ◽  
Size Dimorphism ◽  
Operational Taxonomic Units ◽  
Corvus Corone ◽  
Males And Females ◽  
Hooded Crows

Sexual size dimorphism was analysed across a hybrid zone existing between allopatric populations of Carrion Crows and Hooded Crows (Corvus corone corone and C. c. cornix) in northwestern Italy. Twenty-five morphological (osteological and plumage) variables were measured in a sample of 1599 specimens obtained from allopatric parental areas and from the hybrid zone. For each morphological variable considered, sexual size dimorphism was measured as the ratio of males/females or the absolute difference between mean sizes of males and females within each subpopulation studied. Overall sexual size dimorphism was described by discriminant function analysis. All the sexual size dimorphism measures adopted showed variation across the hybrid zone according to elevation. Male/female ratios and male–female differences significantly differed between the parental allopatric "operational taxonomic units," Carrion Crows being more dimorphic than Hooded Crows. Across the hybrid zone, sexual size dimorphism was correlated with the phenotypic composition of the crow subpopulations and with size of males but not size of females. The data presented show that sexual size dimorphism is correlated with an ecological gradient and that its geographical variation is determined by variation in size of males only.

Dermatophilus spp. and Candida spp. Infections In Free-Living Hooded Crows (Corvus corone cornix)

2016 ◽  
Vol 154 (1) ◽  
pp. 119 ◽  
Author(s):  
F.E. Scaglione ◽  
L. Starvaggi Cucuzza ◽  
P. Pregel ◽  
L. Chiappino ◽  
A. Sereno ◽  
...  
Keyword(s):  
Candida Spp ◽  
Free Living ◽  
Corvus Corone ◽  
Hooded Crows

The diet of coastal breeding hooded crows corvus corone comix

Ecography ◽  
1992 ◽  
Vol 15 (4) ◽  
pp. 337-346 ◽  
Author(s):  
S. D. Berrow ◽  
T. C. Kelly ◽  
A. A. Myers
Keyword(s):  
Corvus Corone ◽  
Hooded Crows
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