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I found a few reports:  


Messerly, E. H. (1979). Rusty Blackbird feeds on American Goldfinch. Bulletin of the Oklahoma Ornithological Society, 12: 67.

Campbell, R. W. (1974). Rusty Blackbirds prey on sparrows. Wilson Bull., 86: 291293.

Long, R. C. and Russ, A. (1968). Rusty Blackbird kills House Sparrow. Ont. Field Biol., 22:28.

Wilson, A. E. (1968). Rusty Blackbird attacks sparrows. Blue Jay, 26: 123.


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