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"Blue jay."
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A bird watcher's guide to blue jays
Learn how to start a bird watching hobby including the habitats and life cycle of blue jays.
Book
The traits that predict the magnitude and spatial scale of forest bird responses to urbanization intensity
As humans continue moving to urban areas, there is a growing need to understand the effects of urban intensification on native wildlife populations. Forest species in remnant habitat are particularly vulnerable to urban intensification, but the mechanisms behind these effects are poorly understood. An understanding of how species traits, as proxies for mechanisms, mediate the effects of urban intensification on forest species can help fill this knowledge gap. Using a large point count dataset from the Second Pennsylvania Breeding Bird Atlas, we tested for the effects of species traits on the magnitude and spatial scale of the responses of 58 forest bird species to urbanization intensity in landscapes surrounding count locations. Average urbanization intensity effect size across species was -0.36 ± 0.49 (SE) and average scale of effect of urbanization intensity was 4.87 ± 5.95 km. Resident forest bird species that are granivorous or frugivorous, cavity-nesting, and have larger clutch sizes and more fledglings per clutch had more positive associations with increasing urbanization intensity in landscapes. In addition, the effect of urbanization intensity on forest birds manifested most strongly at larger spatial scales for granivorous, frugivorous, or omnivorous species that are cavity-nesting, have larger clutch sizes and longer wingspans, and flock in larger numbers. To our knowledge, the present study represents the first direct tests of the effects of species traits on both the magnitude and spatial scale of the effect of urbanization on forest birds, as well as the first evidence that migratory status, clutch size, wingspan, and fledglings per clutch are important determinants of the responses of forest birds to urbanization. We discuss the possible mechanisms underlying our results and their implications for forest bird conservation in urbanizing landscapes.
Journal Article
FIRST OBSERVATION OF BLUE JAY
The golden-cheeked warbler (Setophaga chrysoparia) is an endangered songbird whose eastern breeding range is undergoing rapid urbanization and concomitant changes to the predator community. We document the first observation of a golden-cheeked warbler nest depredated by the range-expanding blue jay (Cyanocitta cristata) to highlight the potential impacts of warbler nest predation by corvids in urban landscapes.
Journal Article
Baxter and Danny stand up to bullying
Buford Blue Jay's bullying drives Baxter and Danny to an open field, where they meet Queen Beth of the Bees who calms them and guides them in helping their friends.
Book
FIRST OBSERVATION OF BLUE JAY NEST
The golden-cheeked warbler (Setophaga chrysoparia) is an endangered songbird whose eastern breeding range is undergoing rapid urbanization and concomitant changes to the predator community. We document the first observation of a golden-cheeked warbler nest depredated by the range-expanding blue jay (Cyanocitta cristata) to highlight the potential impacts of warbler nest predation by corvids in urban landscapes. El chipe mejilla dorada (Setophaga chrysoparia) es una especie de pajaro en peligro de extincion cuya distribucion de reproduccion oriental esta pasando por rapida urbanizacion y cambios concomitantes a la comunidad de depredadores. Documentamos la primera observacion de un nido del chipe mejilla dorada depredado por la chara azul (Cyanocitta cristata) en vias de expansion para resaltar los impactos potenciales de la depredacion de nidos de corvidos en los paisajes urbanos.
Journal Article
Management Techniques to Stimulate Oak Reproduction in Midwestern Oak Savanna Landscapes
Oak reproduction is often scarce or lacking in oak savannas under ecological restoration management, despite the fact that large canopy gaps created by the removal of invasive brush allow abundant sunlight to reach the ground surface. I conducted two experiments to investigate the effect of manipulating surface vegetation on the acorn-caching behavior of squirrels (gray squirrel Sciurus carolinensis; fox squirrel S. niger; or southern flying squirrel Glaucomys volans) and blue jays (Cyanocitta cristata). In Experiment 1, I created 10 × 10 m bare-ground patches prior to the time of acorn dispersal in restored white oak (Quercus alba) savanna and in adjacent unrestored brushy oak woods. I then compared oak seedling establishment in these bare patches the following summer to seedling establishment in unaltered tall vegetation. In Experiment 2, I used a combination of late-summer burning, tilling with an agricultural disc, and applying herbicide to create bare-ground patches adjacent to established oak woods, and then compared oak seedling establishment in these areas the following summer to that in burn-only, mow-only, and unaltered vegetation. In both experiments, oak seedling establishment was greater in areas denuded of ground vegetation. This agrees with previous research, which concluded that blue jays have a preference for storing acorns in areas of low to bare surface vegetation.
Journal Article
Aggressive encounter of a group of blue jays
I describe an occurrence of interference competition between a group of five male scissor-tailed flycatchers (Tyrannus forficatus) and 11 blue jays (Cyanocitta cristata). The interaction was initiated by a subset of two blue jays and concluded after nine additional blue jays arrived at a perch on a sweet gum (Liquidambar styraciflua), causing the scissor-tailed flycatchers to leave the perch and area. Both species exhibited intraspecific cooperation during the encounter.
Journal Article
Predator Vocalizations Alter Parental Return Time at Nests of the Hooded Warbler
A growing body of evidence indicates that vocalizations of predators and perceived risk of predation can significantly alter avian nesting behavior and reproductive performance. However, it is currently unclear whether birds acoustically discriminate among different types of predators and adjust their short-term behavioral responses accordingly. We investigated this issue via playback experiments in which nests of the Hooded Warbler (Setophaga citrina) were exposed to vocalizations of two nest predators, the Blue Jay (Cyanocitta cristata) and Eastern Chipmunk (Tamias striatus), and a dangerous predator of adults and nestlings, Cooper's Hawk (Accipiter cooperii). We used songs of a common nonpredatory passerine, the Red-eyed Vireo (Vireo olivaceus), as a control. In comparison to responses observed during control trials, adult Hooded Warblers delayed their return to the nest following playback of Cooper's Hawk but returned more quickly after playback of the Eastern Chipmunk, probably because Cooper's Hawks are a threat to adult Hooded Warblers while Eastern Chipmunks pose a risk only to eggs and nestlings. Time of return to the nest following playback of the Blue Jay was nearly identical to that after controls, possibly because of the relative rarity of Blue Jays in our study area. Despite its significant effect on return time, playback had no effect on the number of times adults fed nestlings in the following hour. Overall, our results suggest that nesting Hooded Warblers discriminate among the vocalizations of potential predators and adjust the time of return to their nest according to the nature and degree of perceived risk.
Journal Article
Blue Jay
Blue jays are birds that live in most parts of North America, especially in Canada and the central and eastern U.S. states. They are found in forests and in people's backyards. Although they imitate other birds' calls, the blue jay's most common call sounds like \"jay-jay-jay.\" Baby blue jays are called chicks and they hatch from eggs. Adults can live up to 17 years.
Web Resource