The red knot is similar in appearance to a few other species inhabiting the IRL and surrounding areas, including: two species of dowitcher belong to the genus Limnodromus; the sanderling, Calidris alba; and the black-bellied plover, Pluvialis squatarola (Paulson 2005). Both species of dowitcher occurring locally have longer bills than the red knot, generally grayer back coloration, duller red underparts, and smaller white markings on the underparts. Sanderlings are much smaller and black-bellied plovers are larger than C. canutus rufa. Flight Patterns & Locomotion: While in flight, red knots form close flocks with a uniform twisting motion that reveals their gray backs followed by the red of their breasts. Flight speeds of some individuals have been recorded up to 38 mph (Terres 1980).
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- Niles, LJ, Sitters, HP, Dey, AD, Atkinson, PW, Baker, AJ, and 17 others. 2008. Status of the Red Knot (Calidris canutus rufa) in the Western Hemisphere. Studies in Avian Biology No. 36. Cooper Ornithological Society. 185 pp.
- Paulson, D. 2005. Shorebirds of North America: A Photographic Guide. Princeton Univ. Press. Princeton, NJ. USA. 361 pp.
- Peterson, RT. 1980. A Field Guide to the Birds: A Completely New Guide to All the Birds of Eastern and Central North America. Houghton Mifflin. Boston, MA. USA. 384 pp.
- Terres, JK. 1980. The Audubon Society Encyclopedia of North American Birds. Alfred A. Knopf. New York. USA. 1109 pp.
- USFWS. 2010. The red knot (Calidris canutus rufa). U.S. Fish & Wildlife Service. Online at http://www.fws.gov/northeast/redknot/ (Date accessed 08/12/2010).
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