We collected feces of breeding Harlequin Ducks (Histrionicus histrionicus) from interior rivers of Northern Quebec, Labrador and Newfoundland to document their summer food habits. We obtained 42 samples from 50 ducks. All samples contained recognizable food items, and the mean number of taxa identified per sample was 3.6 (SD=1.6, range =1-7). Overall, a total of 10,222 organisms from 25 taxa were identified. Nearly all (99.7 /100) food items were insects; the rest were mollusks and mites. Among insects, Simuliidae larvae Were the most common food item, representing 87.2 /100 of all prey counted.
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