Biometric data were collected from Dippers Cinclus cinclus in Navarre (northern Spain) between 1992 and 1994. Male and female individuals of any age could be separated by using a discriminant function in the form y + 2x > 243 for male individuals, where y = weight in g and x = wing length in mm. All measurements (bill, wing, tarsus, weight) differed significantly between the sexes, but not between adults and first years within sexes. Average wing length in Navarre is the smallest so far published for Dippers in Europe. While broadly supporting Bergmann's rule about effect by latitude, local differences from other Spanish populations suggest that other features also influence body size in Dippers.

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