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In my youth I read that the Dickcissel is the Jekyll and Hyde Bird because, while in North America Dickcissels eat mainly insects, in Venezuela (where most winter), they consume almost entirely rice and sorghum. I have seen video clips of thousands of Dickcissels dripping like African locusts from Venezuelan sorghum. This behavior does not amuse Venezuelan farmers and may be one reason for the Dickcissel's historic population decline.
Back in the USA, Dickcissels are polygamous prairie birds. Females pick their mates by the quality of the males' territories, as measured by the availability of nesting sites (rather than food resources). Males have been known to have up to six mates. On a yearly basis, Dickcissels tend to be nomadic, and therefore their numbers fluctuate annually. One year they are abundant, the next they are absent.
Spiza americana), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu.bnaproxy.birds.cornell.edu/bna/species/703