Smaller on the left? Flexible association between space and magnitude in pigeons (Columba livia) and blue jays (Cyanocitta cristata).

2020 ◽  
Vol 134 (1) ◽  
pp. 71-83 ◽  
Author(s):  
Olga F. Lazareva ◽  
Kristy Gould ◽  
Jamie Linert ◽  
Damien Caillaud ◽  
Regina Paxton Gazes
Keyword(s):  
Columba Livia ◽  
Cyanocitta Cristata ◽  
Blue Jays

scholarly journals Visual Detection of Cryptic Prey by Blue Jays (Cyanocitta cristata)

Science ◽  
1977 ◽  
Vol 195 (4278) ◽  
pp. 580-582 ◽  
Author(s):  
A. T. PIETREWICZ ◽  
A. C. KAMIL
Keyword(s):  
Visual Detection ◽  
Cyanocitta Cristata ◽  
Blue Jays

scholarly journals WEST NILE VIRUS DETECTION IN THE ORGANS OF NATURALLY INFECTED BLUE JAYS (CYANOCITTA CRISTATA)

2005 ◽  
Vol 41 (2) ◽  
pp. 354-362 ◽  
Author(s):  
Samantha E. J. Gibbs ◽  
Angela E. Ellis ◽  
Daniel G. Mead ◽  
Andrew B. Allison ◽  
J. Kevin Moulton ◽  
...  
Keyword(s):  
West Nile Virus ◽  
Virus Detection ◽  
West Nile ◽  
Cyanocitta Cristata ◽  
Blue Jays

Responses of Blue Jays (Cyanocitta Cristata) to Raptors that Differ in Predatory Threat

2018 ◽  
Vol 11 (3) ◽  
pp. 159-166 ◽  
Author(s):  
Julie A. Dahl ◽  
Gary Ritchison
Keyword(s):  
Low Frequency ◽  
Peak Frequency ◽  
Cyanocitta Cristata ◽  
Bubo Virginianus ◽  
Corvus Brachyrhynchos ◽  
Buteo Jamaicensis ◽  
Accipiter Cooperii ◽  
Accipiter Striatus ◽  
Breeding Seasons ◽  
Blue Jays

Some species of birds use their vocalisations to communicate predator presence and the level of threat they pose, including two species of corvids (Corvidae), American Crows (Corvus brachyrhynchos) and Siberian Jays (Perisoreus infaustus). Our objective was to determine if Blue Jays (Cyanocitta cristata), another corvid, also use specific calls or vary the characteristics of certain calls to convey information about the level of threat posed by aerial predators. During the non-breeding seasons of 2014 and 2015, we recorded and analysed the vocal responses of Blue Jays to study skins of six species of raptors that varied in size and the level of threat they pose to Blue Jays. Experiments were conducted at seven locations in Madison County, Kentucky. The mean number of Blue Jays present during trials was 2.6, and Blue Jays uttered five different vocalisations during trials, with ditonal and monotonal jeers given most frequently. The rate at which Blue Jays uttered ditonal jeers differed among trials, with rates highest during trials with an Eastern Screech-Owl (Megascops asio) and a Sharp-shinned Hawk (Accipiter striatus). However, the characteristics of ditonal and monotonal jeers (duration, low frequency, high frequency, and peak frequency) did not differ among trials. These results suggest that Blue Jays may either perceive Eastern Screech-Owls and Sharp-shinned Hawks as the greatest threats or, alternatively, as potential, but less threatening predators, and, therefore, they were willing to take greater risks when mobbing them. In contrast, Blue Jays mobbed the other raptors, i.e. American Kestrels (Falco sparverius), Red-tailed Hawks (Buteo jamaicensis), and Great Horned Owls (Bubo virginianus), with much less intensity, likely because they posed less of a threat or, in the case of Cooper's Hawks (Accipiter cooperii) that are known predators of Blue Jays, perhaps because mobbing with greater intensity, e.g. approaching more closely, posed too great a risk. Blue Jays in our study used the same calls with the same characteristics when responding to potential predators, only calling rates differed. However, such variation in calling rates when mobbing would likely provide useful information about the presence of, and possibly the threat posed by, potential predators for conspecifics and, perhaps, heterospecifics.

Habitat and Nesting Success of Blue Jays (Cyanocitta cristata): Importance of Scale

The Auk ◽  
2002 ◽  
Vol 119 (4) ◽  
pp. 971-983 ◽  
Author(s):  
Keith A. Tarvin ◽  
Mary C. Garvin
Keyword(s):  
Nesting Success ◽  
Cyanocitta Cristata ◽  
Blue Jays

Fledgling Blue Jays (Cyanocitta cristata) Raised in Captivity

Bird-Banding ◽  
1967 ◽  
Vol 38 (1) ◽  
pp. 77
Author(s):  
Lloyd A. Mitterling
Keyword(s):  
Cyanocitta Cristata ◽  
In Captivity ◽  
Blue Jays

Startle and Habituation Responses of Blue Jays (Cyanocitta Cristata) in a Laboratory Simulation of Anti-Predator Defenses of Catocala Moths (Lepidoptera: Noctuidae)

Behaviour ◽  
1993 ◽  
Vol 126 (1-2) ◽  
pp. 77-95 ◽  
Author(s):  
Victoria Ingalls
Keyword(s):  
Laboratory Experiments ◽  
Food Reward ◽  
Laboratory Simulation ◽  
Cyanocitta Cristata ◽  
Avian Predators ◽  
Predator Pressure ◽  
Visual Characteristics ◽  
Habituation Process ◽  
Lepidoptera Noctuidae ◽  
Blue Jays

AbstractBlue jays were used in laboratory experiments to determine what visual characteristics of Catocala hindwings are important in eliciting and maintaining startle reactions in avian predators. Hand-reared blue jays, inexperienced with warningly coloured, inedible prey, took significantly longer to touch novel colours that possessed bold, black bands than to touch novel, unbanded colours when these discs covered a food reward. Thus, being conspicuous (as opposed to simply being novel) appears to enhance startle reactions. Bold patterns are commonly found on aposematic prey and Catocala hindwings. These same hand-reared birds also tended to take longer to touch novel coloured discs of yellow and red hues as opposed to discs of blue, green, or purple hues. The colours that produced the greatest hesitation are similar to the colours found on Catocala hindwings. Red-yellow colours are also characteristic of aposematic prey. Wild-caught birds took longer to habituate to startling stimuli when presented with several different startling disc types during the habituation process. Thus, predator pressure may explain why several different Catocala species with different hindwing colours occur sympatrically.

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