A check-list of the birds of the rio Peixoto de Azevedo, Mato Grosso, Brazil (10º 10' S, 54º 50' W) is presented, based on collections prepared by Werner Bokermann and Emílio Dente during the months of July and August, 1976; June through August, 1977; August of 1978; March, May, June, August and October, 1979; August of 1980 and only sporadically after these dates. Each species account includes the date that specimens were collected, gonad development, weight, color of the soft parts (iris, bill and tarsus), and, when necessary, notes on systematics. Measurements are presented in millimeters and weights in grams, with the mean of the sample expressed between parentheses. Theses data are yet scanty in brazilian ornithological literature.