Cyanocitta cristata

Adult Utetheisa tend to be rejected also by birds (blue jays, Cyanocitta cristata scrub jays, Apkelocoma coemlescens T.E., unpublished observations), as might be expected, given their aposematism, but there is no definitive evidence that the unacceptability is due specifically to the PAs. 

Remains of acorns of red oak, Quercus rubra, after gray squirrels, Sciurus carolinensis) have been feeding on them. Top row. cross section of acorn, with radicle barely visible at apical pole at the bottom. Middle row. Parts of acorns left behind by squirrels. They discard apical pole (with radicle visible). Such pieces are later consumed by birds such as blue jays (Cyanocitta cristata). Bottom row. pieces of acorn shells. Photo D. MiiUer-Schwarze... 

Birds and squirrels at capsaicin-treated food. Top Bluejay (Cyanocitta cristata) feeds on capsaicin-treated birdseed, while gray squirrel (Sciurus cadrolinensis) simultansously feeds on untreated birdseed. Bottom Simultaneously, bluejay feeds on birdseed treated with capsaicin (a mammal repellent), and a gray squirrel feeds on birdseed treated with methyl anthrandate, a bird repellent... 

Irruptive migration occurs in species which do not migrate at all during some years, but may do so during other years, when the winter is particularly cold or food particularly scarce. For example, some populations of blue jays Cyanocitta cristata) are believed to migrate only when their winter food of acorns is scarce. 

Bacillus subtilis Cyanocitta cristata Escherichia coli Pneumococcus aureus Salmonella sp. a bacterium of the... 

Red-winged blackbird, Agelaius phoeniceus, 96, 123, 133, 235, 242, 446, 505 Bluebird, Sialia sialis. 111 Bluejay, Cyanocitta cristata, 718 Bobwhite, common, Colinus virginiams, 34, 123,... 

Discrimination and generalization of leaf damage by blue jays (Cyanocitta cristata), Anim. Learn. Behav., 12 202. 

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