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Measurements
Linear
On the basis of museum measurements of adults collected during Apr–Jun, females are slightly (but not significantly) longer-winged than males (Table 1 and Tomkovich 1992); females have significantly longer-bills than males (Table 1 and Tomkovich 1992). When locality is taken into account, adult female knots in western U.S. areas (perhaps roselaari) have significantly longer bills and wings than males (Tomkovich 1992), whereas there were no significant differences between the sexes among specimens from ne. U.S. (likely rufa).
Comparisons of wing and bill lengths within sex and age categories from ne. and w. U.S. locations, summarized in Table 1, show that Atlantic specimens tend to be shorter-billed and shorter-winged than western specimens.
Mass
Varies seasonally, with lowest mean mass during early winter (125 g) and highest mean values during spring (205 g) and fall (172 g) migration (see Table 2; see also Migration, above, and Food habits: nutrition and energetics, above).
Harrington, Brian A. 2001. Red Knot (Calidris canutus), 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/bna/species/563
