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1 December 2011 Evidence of Medullary Bone in Two Species of Thrushes
Maria E. Squire, Joe C. Brague, Robert J. Smith, Jennifer C. Owen
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We used micro-computed tomography to examine if medullary bone was present in Wood Thrush (Hylocichla mustelina) and Veery (Catharus fuscescens), two species of Passeriformes. We scanned bones from males and females collected during spring and fall migration, and the breeding season. Medullary bone was found in the humerus, radius-ulna, and tibiotarsus-fibula of a breeding female Wood Thrush and a breeding female Veery, both of which were ovulatory at necropsy. Two other breeding female Wood Thrush, both post-ovulatory at necropsy, did not have medullary bone. We did not observe medullary bone in females collected during spring or fall migration, nor in any males. Our findings support the presence of medullary bone in breeding female passerines, but future studies with larger, targeted sample sizes are needed to examine the phenology of medullary bone formation and resorption, and to explore the extent of medullary bone's role in eggshell formation in passerines.

Maria E. Squire, Joe C. Brague, Robert J. Smith, and Jennifer C. Owen "Evidence of Medullary Bone in Two Species of Thrushes," The Wilson Journal of Ornithology 123(4), 831-835, (1 December 2011).
Received: 20 January 2011; Accepted: 1 April 2011; Published: 1 December 2011
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