Magnolia Warbler (Dendroica magnolia) Science Article 1
A juvenile Gray Jay (Perisoreus canadensis) was observed to capture, kill, and eata healthy juvenile Magnolia Warbler (Dendroica magnolia), demonstrating that Gray Jaysdepredate free-flying birds in addition to nestlings and dead adults. Predation of birds, which was manifested in a recently independent bird, may be a regular feature of Gray Jay biology.
WILLIAM H. BARNARD, J. Field Ornithol., 67(2):252-253