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First-year birds lose the bursa of Fabricius by their first spring; one individual had almost fully regressed bursae in Nov (McNeil and Burton 1972). Cranial pneumatization patterns cannot be used to determine age in this species (McNeil and Burton 1972).
See Nichols (1923) for comparison of skeletal differences between Lesser and Greater yellowlegs and Cramp and Simmons (1983) for description of structure.
Tibbitts, T. Lee and William Moskoff. 1999. Lesser Yellowlegs (Tringa flavipes), 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/427
