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Temporal change in gullet food passage of 15 penned red-winged blackbirds (13 males, 2 females) was studied. Tenebrio sp. larvae were present in esophagi up to 10 min after ingestion, but disappeared within 20 min. Seed remained in the esophagi for up to 20 min, but disappeared within 30 min. Seed in the combined esophagus–proventriculus (gullet) declined significantly by 30 min postingestion. Whereas larvae in the proventriculi showed a temporal decline in relative importance, seed showed a corresponding increase in relative importance. A possible bias in analysis of food habits because of inclusion of proventricular food in the analysis may be resolved by comparing gullet food proportions with those of esophagi for all sampled birds.Procedures are recommended for research on the feeding ecology of the red-winged blackbird.

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